Proto-Indo-European root meaning "door, doorway." The base form is frequently in dual or plural, leading to speculation that houses of the original Indo-Europeans had doors with two swinging halves.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit duárah "door, gate;" Old Persian duvara- "door;" Lithuanian dùrys (plural); Greek thyra "door;" Latin foris "out-of-doors, outside;" Gaulish doro "mouth;" Old Prussian dwaris "gate;" Russian dver' "a door;" Old English dor, German Tür "door," Gothic dauro "gate."
"killing of one's child or children," 1824, introduced by Dr. John Gordon Smith in the 2nd edition of his "Principles of Forensic Medicine;" from Latin proles "offspring" (see prolific) + -cide "a killing."
It is hoped that this word will be considered entitled to reception, on the score of analogy. We have long had parricide, fratricide, and infanticide, all (if I may use the figure of speech,) of the same family; and recently the very appropriate term foeticide has been introduced into Forensic Medicine. In both these last crimes there is a peculiarity arising from the person accused being, in almost every instance, the parent .... In this relation to the beings destroyed, the general term of murderer, or murder of offspring seems to be the fair converse of parricide; and will suit well the purpose of the Medico-legal writer, who considers the two cases as parts of one subject, for the designation of which collectively a proper term was wanting. [Smith]
It is an established fact, that under the fifth month no foetus can be born alive—from the fifth to the seventh it may come into the world alive, but cannot maintain existence. The French term these non viable. We may designate them non-rearable, or more properly immature—in distinction to those between the seventh and the ninth month, which may be reared, and are termed premature. [John Gordon Smith, M.D., "The Principles of Forensic Medicine," London, 1821]
1540s, "the expulsion of the fetus before it is viable," originally of deliberate as well as unintended miscarriages; from Latin abortionem (nominative abortio) "miscarriage; abortion, procuring of an untimely birth," noun of action from past-participle stem of aboriri "to miscarry, be aborted, fail, disappear, pass away," a compound word used in Latin for deaths, miscarriages, sunsets, etc., which according to OED is from ab, here as "amiss" (see ab-), + stem of oriri "appear, be born, arise" (see origin).
Meaning "product of an untimely birth" is from 1630s; earlier in this sense was abortive (early 14c.). Another earlier noun in English for "miscarriage" was abort (early 15c.). In the Middle English translation of Guy de Chauliac's "Grande Chirurgie" (early 15c.) Latin aborsum is used for "stillbirth, forced abortion." Abortment is attested from c. 1600; aborsement from 1530s, both archaic. Aborticide (1875) is illogical. Compare miscarriage.
In 19c. some effort was made to distinguish abortion "expulsion of the fetus between 6 weeks and 6 months" from miscarriage (the same within 6 weeks of conception) and premature labor (delivery after 6 months but before due time). The deliberate miscarriage was criminal abortion. This broke down late 19c. as abortion came to be used principally for intentional miscarriages, probably via phrases such as procure an abortion.
Criminal abortion is premeditated or intentional abortion procured, at any of pregnancy, by artificial means, and solely for the purpose of preventing the birth of a living child : feticide. At common law the criminality depended on the abortion being caused after quickening. [Century Dictionary, 1899]
Foeticide (n.) appears 1823 as a forensic medical term for deliberate premature fatal expulsion of the fetus; also compare prolicide. Another 19c. medical term for it was embryoctony, with second element from a Latinized form of Greek kteinein "to destroy." Abortion was a taboo word for much of early 20c., disguised in print as criminal operation (U.S.) or illegal operation (U.K.), and replaced by miscarriage in film versions of novels. Abortium "hospital specializing in abortions," is from 1934, in a Soviet Union context.