Callosity

Callosity (pronounced kuh-los-i-tee)

(1) In pathology, an alternative name for a callus.

(2) In botany, a hardened or thickened part of a plant.

(3) In zoology, as ischial callosity, a large callus on the butts of certain animals.

(4) In the human condition, being of a callous demeanor; insensitivity or hard-heartedness

1375–1425: From the late Middle English calosite, from the Late Latin callōsitās, the construct being callōs(us) (callous) (from callum (hardened skin) +‎ -ōsus (the suffix added to a noun to form an adjective indicating an abundance of that noun)) + -itās which in English was rendered as callus + -ity, the substitute “o” a familiar device.  The –ity suffix was from the French -ité, from the Middle French -ité, from the Old French –ete & -eteit (-ity), from the Latin -itātem, from -itās, from the primitive Indo-European suffix –it.  It was cognate with the Gothic –iþa (-th), the Old High German -ida (-th) and the Old English -þo, -þu & -þ (-th).  It was used to form nouns from adjectives (especially abstract nouns), thus most often associated with nouns referring to the state, property, or quality of conforming to the adjective's description.  Callosity is a noun; the noun plural is callosities.

Essentially a thickening of the skin which forms in response to damage, a callus is one of the body’s protective mechanisms and example of how human skin have evolved to respond to a “fragile” area by replacing it with something “anti-fragile”.  The skin is a good barrier to much which would be dangerous if able to penetrate the surface but easily it can be cut and it’s prone to delimitation if exposed to repeated friction, something well known to gardeners digging holes, the skin on the palms of the hands soon “wearing off” at the points where the handle of the shovel repeatedly rubs.  That will be painful but the body will respond, replacing the dead skin with new skin which is thicker and harder, thus enabling the gardener to soon again pick up their shovel and return to their excavations.  This is an example of the general principle of healthy human physiology which responds to damage not by replacing things with something just as strong but something stronger, able to resist whatever force it was which caused the injury and it is the same with a bone fracture; when the bone knits back together, it will not be merely as strong as it was but a little stronger.  The new skin on the gardener’s hands will also be stronger and as the holes continue to be dug, the skin will become more robust still but the difference should not be thought of as fragile vs robust but as fragile vs anti-fragile, the point being that as pressure is applied, the material responds by becoming less-fragile.

Fragile and robust, although often used as antonyms (and in general use usefully so because the meanings are so well conveyed and understood) are really not opposites but simply degrees of the same thing.  In the narrow technical sense an expression of robustness or fragility is a measure of the same thing; a degree of strength.  The traditions of language obscure this but it becomes clear if measures of fragility or robustness are reduced to mathematics and expressed as comparative values in numbers.  It's true that on such a continuum a point could be set at which point something is regarded as no longer robust and becomes defined as fragile (indeed this is the essence of stress-testing) but this doesn't mean one is the antonym of the other.  The opposite of fragile is actually anti-fragile (the anti prefix was from the Ancient Greek ἀντι- (anti-) (against, hostile to, contrasting with the norm, opposite of, reverse (also "like, reminiscent of"))).  The concept is well known in physiology and part of the object in some forms of strength training is to exploit the propensity of muscles to tear at stress points, relying on the body to repair these tears in a way that doesn’t restore them to their original form but makes them stronger so that if subjected again to the same stress, a tear won’t happen.  It’s thus an act of anti-fragility, the process illustrated also by the calluses which form on the hands after the skin blisters in response to work.  Fragile and robust merely express points on a spectrum and are used according to emphasize the extent of strength; anti-fragile is the true opposite.

The idea of anti-fragile was introduced by Lebanese-born, US-based mathematician and trader Nassim Nicholas Taleb (b 1960) in the book Antifragile: Things That Gain From Disorder (2012), the fourth of five works which explore his ideas relation to uncertainty, randomness & probability, the best-known and most influential was The Black Swan: The Impact of the Highly Improbable (2007).  His work was thoughtful, intriguing and practical and was well received although the more accessible writing he adopted for the later volumes attracted criticism from some who felt an academic style more suited to the complex nature of his material; probably few who read the texts agreed with that.  Apart from the ideas and the use to which they can be put, his deconstruction of many suppositions was also an exploration of the rigidities of thought we allow our use of language to create.

Anti-callus devices (gloves the most common type) are used when the aim is to avoid the growth of a callus, the use of an “artificial callus” sometimes preferable to the natural.  A carpet layer in knee pads (left) and bra strap “cushions” (right).

When the new areas of skin are called calluses (calli the alternative plural), callus from the Latin callum (hard skin).  Most often used to describe the hardened areas of skin (typically on hands & feet) induced as a response to repeated friction, wear or use, in anatomy, the same word is applied to the initially soft or cartilaginous substance exuded at the site of a bone fracture which converts ultimately into bone, knitting the fragments into the one piece.  One the process fully is complete, if again exposed to the same stress, the bone will not break.  In botany, it’s used of the new formation over the end of a cutting. Callus is a noun & verb, the calluses, the present participle callusing and the past, callused.

In some professions, the callus can be close to essential; those whose life involves supporting weights on their shoulders form them on the pressure points, enabling them to ply their trade without undue pain or further damage.  However, not all whose shoulders might suffer welcome calluses, however beneficial they might be:  Women who wish to avoid what manufactures term the “shoulder grooving” caused by the pressure of their bra’s shoulder straps (the physics of this a product of (1) the weight supported and (2) its surface distribution which is dictated essentially by the width of the strap) can buy inserts for the straps which increase the surface area, thereby reducing the specific loading by re-distributing the downward pressure.  A variation on this idea is the “knee pad” worn by those who lay carpets, floor tiles and such.  These folk are compelled to work “on their knees” for hours at a time, often upon hard and sometimes rough surfaces and although, given time, calluses would form were the work to be performed unprotected, it would not be a pleasant experience and the degree of hardening needed would likely adversely affect normal mobility.  In zoology, calluses are a noted environmental adaptation among some species, (Old World) gibbons, monkeys and some chimpanzees having evolved notably large calluses on their butts (described as ischial callosities (the seventeenth century ischium (from the Latin ischium, from the Ancient Greek ἰσχίον (iskhíon) (hip joint)) describing the lowest of the three bones that make up each side of the pelvis).  On the animals so endowed, the advantage is the ability to sleep while sitting upright on thin branches, safe from both predators and the risk of falling.

Lindsay Lohan and her lawyer in court, Los Angeles, December 2011.

In figurative use callosity came to be used to refer to one with a lack of feeling or capacity for emotion but the use when documented comes usually with the caveat that those so described are not “psychopaths” but merely the “hard-hearted”.  So it’s there to be used and if it seems not to suit, English offers has quite an array of choice when speaking of those lacking emotional range.  There is “heartless” & “hard-hearted”, both of which allude to the ancient idea of the special significance of the heart as the source of all that human feeling and character; even now it’s known to be a “just a pump”, the romantic notions persist in many culture and variations of the ❤ symbol are among the most frequently used emojis.  “Cold-blooded” is different in that although it’s blood the heart pumps, the operative word really is “cold”, implying decisions made or actions taken without emotion intruding and in idiomatic use, a “cold-blooded murder” (such as a contract killing done for payment) is viewed with less sympathy than a crime of passion (such murderers of said to have been “seeing the red mist” of “hot” blood at the time of their crime.  “Stolid” and “impassive” differs in that they can often be virtues and anyway suggest not an absence of capacity for feeling but its repression and one who wrote on how essential that was to civilization yet simultaneous damaging to individuals was Sigmund Freud (1856-1939), his ideas later taken up by German-American philosopher Herbert Marcuse (1898–1979).  Mankind probably didn’t surprise Freud but doubtless we disappointed Marcuse.  Finally, there is “stoic” which traces back to the Hellenic school of stoicism, a philosophy with a great following in Antiquity which was intended always to be practical, a way to help citizens live good lives rather than anything concerned with abstractions.  In its pure form it survives in that form but the modern re-purposing of the word means it’s now used to mean something like “suffering in silence”.  “Callosity” then is one of many ways to refer to the “unfeeling” and its use in this context is based on the use in medicine, a callosity (ie a callus) being “skin of abnormal hardness & thickness” which can be poked or pricked with the subject barely feeling the intrusion.  In that it’s subtly different from “thick skinned” which usually means “not easily offended”.