Etymology
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Words related to -gen

*gene- 

*genə-, also *gen-, Proto-Indo-European root meaning "give birth, beget," with derivatives referring to procreation and familial and tribal groups.

It forms all or part of: Antigone; autogenous; benign; cognate; congener; congenial; congenital; connate; cosmogony; cryogenic; degenerate; engender; engine; epigone; eugenics; -gen; gendarme; gender; gene; genealogy; general; generate; generation; generic; generous; genesis; -genesis; genial; -genic; genital; genitive; genius; genocide; genotype; genre; gens; gent; genteel; gentile; gentle; gentry; genuine; genus; -geny; germ; german (adj.) "of the same parents or grandparents;" germane; germinal; germinate; germination; gingerly; gonad; gono-; gonorrhea; heterogeneous; homogeneous; homogenize; homogenous; impregnate; indigenous; ingenious; ingenuous; innate; jaunty; kermes; kin; kindergarten; kindred; king; kind (n.) "class, sort, variety;" kind (adj.) "friendly, deliberately doing good to others;" Kriss Kringle; malign; miscegenation; nada; naive; nascent; natal; Natalie; nation; native; nature; nee; neonate; Noel; oncogene; ontogeny; photogenic; phylogeny; pregnant (adj.1) "with child;" primogenitor; primogeniture; progenitor; progeny; puisne; puny; renaissance; theogony; wunderkind.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit janati "begets, bears," janah "offspring, child, person," janman- "birth, origin," jatah "born;" Avestan zizanenti "they bear;" Greek gignesthai "to become, happen," genos "race, kind," gonos "birth, offspring, stock;" Latin gignere "to beget," gnasci "to be born," genus (genitive generis) "race, stock, kind; family, birth, descent, origin," genius "procreative divinity, inborn tutelary spirit, innate quality," ingenium "inborn character," possibly germen "shoot, bud, embryo, germ;" Lithuanian gentis "kinsmen;" Gothic kuni "race;" Old English cennan "beget, create," gecynd "kind, nature, race;" Old High German kind "child;" Old Irish ro-genar "I was born;" Welsh geni "to be born;" Armenian cnanim "I bear, I am born."

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oxygen (n.)

gaseous chemical element, 1790, from French oxygène, coined in 1777 by French chemist Antoine-Laurent Lavoisier (1743-1794), from Greek oxys "sharp, acid" (from PIE root *ak- "be sharp, rise (out) to a point, pierce") + French -gène "something that produces" (from Greek -genes "formation, creation;" see -gen).

Intended to mean "acidifying (principle)," it was a Greeking of French principe acidifiant. So called because oxygen was then considered essential in the formation of acids (it is now known not to be). The element was isolated by Priestley (1774), who, using the old model of chemistry, called it dephlogisticated air. The downfall of the phlogiston theory required a new name, which Lavoisier provided. Oxygen-mask is attested from 1912.

allogenic (adj.)
1888 in geology, from Greek allogenes "of another race, stranger," from allos "other, another, different" (see allo-) + -genes "born" (see -gen) + -ic. An earlier adjective was allogeneous "of a different kind or nature" (1842).
androgen (n.)
"male sex hormone," 1936, from andro- "man, male" + -gen "thing that produces or causes."
antigen (n.)
"substance that causes production of an antibody," 1908, from German Antigen, from French antigène (1899), from anti(body) (see antibody) + -gen.
biogen (n.)

1882, "hypothetical soul-stuff, the substance of a proposed spiritual body," coined by U.S. scientist Elliott Coues; see bio- + -gen. From 1899 as "hypothetical protoplasmic unit," from German Biogen (1895). Related: Biogenetic; biogenation.

carcinogen (n.)
"cancer-causing substance," 1853, from carcinoma "malignant tumor, cancer" + -gen.
collagen (n.)

also collogen, structural protein of connective tissue, 1843, from French collagène, from Latinized form of Greek kolla "glue" + -gen "giving birth to" (see -gen). Related: Collagenous.

estrogen (n.)
coined 1927 from combining form of estrus + -gen. So called for the hormone's ability to produce estrus.
-genic 
word-forming element meaning "producing, pertaining to generation;" see -gen + -ic.