Acephalous

Acephalous (pronounced ey-sef-uh-luhs)

(1) In zoology, a creature without a head or lacking a distinct head (applied to bivalve mollusks).

(2) In the social sciences, political science & sociology, a system of organisation in a society with no centralized authority (without a leader or ruler), where power is in some way distributed among all or some of the members of the community.

(3) In medicine, as (1) acephalia, a birth defect in which the head is wholly or substantially missing & (2), the congenital lack of a head (especially in a parasitic twin).

(4) In engineering, an internal combustion piston engine without a cylinder head.

(5) In botany, a plant having the style spring from the base, instead of from the apex (as is the case in certain ovaries).

(6) In information & communications technology (ICT), a class of hardware and software (variously headless browser, headless computer, headless server etc) assembled lacking some feature or object analogous with a “head” or “high-level” component.

(7) In prosody, deficient in the beginning, as a line of poetry that is missing its expected opening syllable.

(8) In literature, a manuscript lacking the first portion of the text.

1725-1735: From French acéphale (the construct being acéphal(e) + -ous), from the Medieval Latin acephalous, from the Ancient Greek ἀκέφαλος (aképhalos) (headless), the construct being ἀ- (a-) (not) + κεφαλή (kephalḗ) (head), thus synchronically: a- +‎ -cephalous.  The translingual prefix a- was from the Ancient Greek ἀ- (a-) (not, without) and in English was used to form taxonomic names indicating a lack of some feature that might be expected.  The a- prefix (with differing etymologies) was also used to form words imparting various senses.  Acephalous & acephalic are adjectives, acephalousness, acephalia & acephaly are nouns and acephalously is an adverb; the noun plural is acephali.

In biology (although often literally synonymous with “headless”), it was also used to refer to organisms where the head(s) existed only partially, thus the special use of the comparative "more acephalous" and the superlative "most acephalous", the latter also potentially misleading because it referred to extreme malformation rather than absence (which would be something wholly acephalous).  In biology, the companion terms are anencephalous (without a brain), bicephalous (having two heads), monocephalous (used in botany to describe single-headed, un-branched composite plants) & polycephalous (many-headed).

Acephalous: Lindsay Lohan “headless woman” Halloween costume.

The word’s origins were in botany and zoology, the use in political discussion in the sense of “without a leader” dating from 1751.  The Acephali (plural of acephalus) were a people, said to live in Africa, which were the product of the imagination of the writers of Antiquity, said by both the Greek historian Herodotus (circa 487-circa 425 BC) and Romano-Jewish historian Flavius Josephus (circa 37–circa 100) to have no heads (sometimes removable heads) and Medieval historians picked up the notion in ecclesiastical histories, describing thus (1) the Eutychians (a Christian sect in the year 482 without a leader), (2) those bishops certain clergymen not under regular diocesan control and later a class of levelers in the time of Henry I (circa 1068–1135; King 1100-1135).  The word still sometimes appears when discussing religious orders, denominations (or even entire churches) which reject the notion of a separate priesthood or a hierarchical order including such as bishops, the ultimate evolution of which is popery.

Acephalousness in its age of mass production: Marie Antoinette (1755–1793; Queen Consort of France 1774-1792) kneeling next to her confessor, contemplates the guillotine on the day of her execution, 16 October 1793.  Colorized version of a line engraving with etching, 1815.

In political science, acephalous refers to societies without a leader or ruler in the Western sense of the word but it does not of necessity imply an absence of leadership or structure, just that the arrangements don’t revolve around the one ruler.  Among the best documented examples were the desert-dwelling tribes of West Africa (notably those inhabiting the Northern Territories of the Gold Coast (now Ghana)), the arrangements of which required the British colonial administrators (accustomed to the ways of India under the Raj with its Maharajas and institutionalized caste system) to adjust their methods somewhat to deal with notions such as distributed authority and collective decision making.  That said, acephalous has sometimes been used too freely.  It is inevitably misapplied when speaking of anarchist societies (except in idealized theoretical models) and often misleading if used of some notionally collectivist models which are often conventional leadership models in disguise or variations of the “dictatorship of the secretariat” typified by the early structure of Stalinism.

The Acephalous Commer TS3

A curious cul-de-sac in engineering, Commer’s acephalous TS3 Diesel engine (1954-1972) was a six-cylinder, two-stroke system, the three cylinders in a horizontal layout, each with two pistons with their crowns facing each other, the layout obviating any need for a cylinder head.  The base of each piston was attached to a connecting rod and a series of rockers which then attached to another connecting rod, joined to the single, centrally located crankshaft at the bottom of the block, a departure from other “opposed piston” designs, almost all of which used twin crankshafts.  The TS3 was compact, powerful and light, the power-to-weight ratio exceptional because without components such as a cylinder heads, camshafts or valve gear, internal friction was low and thermal efficiency commendably high, the low fuel consumption especially notable.  In other companies, engineers were attracted to the design but accountants were sceptical and there were doubts reliability could be maintained were capacity significantly increased (the TS3 was 3.3 litres (200 cubic inch) and when Chrysler purchased Commer in 1967, development ceased although an eight-piston prototype had performed faultlessly in extensive testing.  Production thus cease in 1972 but although used mostly in trucks, there was also a marine version, many examples of which are still running, the operators maintaining them in service because of the reliability, power and economy (although the exhaust emissions are at the shockingly toxic levels common in the 1960s).

Acephalous information & communications technology (ICT)

A headless computer (often a headless server) is a device designed to function without the usual “head” components (monitor, mouse, keyboard) being attached.  Headless systems are usually administered remotely, typically over a network connection although some still use serial links, especially those emulating legacy systems.  Deployed to save both space and money, numerous headless computers and servers still exist although the availability of KVM (and related) hardware which can permit even dozens of machines to be hard-wired to the one keyboard/mouse/monitor/ combination has curbed their proliferation.

A headless browser is a web browser without a graphical user interface (GUI) and can thus be controlled only be from a command-line interface or with a (usually) automated script, often deployed in a network environment.  Obviously not ideal for consumer use, they’re ideal for use in distributed test environments or automating tasks which rely on interaction between web pages.  Until methods of detection improved, headless browsers were a popular way of executing ploys such as credential stuffing, page-view building or automated clicking but there now little to suggest they’re now anymore frequently used as a vector for nefarious activity than conventional browsers with a GUI attached.

Browsing for nerds: Google’s acephalous Headless Chrome.

Headless software is analogous with but goes beyond the concept of a headless computer in that it’s designed specifically to function without not just a GUI or monitor but even the hardware necessary to support the things (notably the video card or port).  Whereas some software will fail to load if no video support is detected, headless software proceeds regardless, either because it’s written without such parameter checking or it includes responses which pass “false positives”, emulating the existence of absent software.  Headless software operated in a specialized (horizontal in terms of industries supplied but vertical in that the stuff exists usually in roles such as back-to-front-end comms on distributed servers) niche, the advantage being the two end can remain static (as some can be for years) while bridge between the two remains the more maintenance intensive application programming interface (API), the architecture affording great flexibility in the software stack.