Etymology
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-gamous 
word-forming element meaning "marrying," from Greek gamos "marriage, a wedding" (see gamete) + -ous.
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-gamy 
word-forming element meaning "marriage" in anthropology and "fertilization" in biology, from Greek -gamia, from gamos "marriage" (see gamete).
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gastro- 

also gastero-, before vowels gastr-, scientific word-forming element meaning "stomach," from Greek gastro-, combining form of gaster (genitive gastros) "belly, paunch; womb" (see gastric). Also used in compounds in ancient Greek, as gastrobarys "heavy with child."

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-gate 
suffix attached to any word to indicate "scandal involving," 1973, abstracted from Watergate, the Washington, D.C., building complex that was home of the National Headquarters of the Democratic Party when it was burglarized June 17, 1972, by operatives later found to be working for the staff and re-election campaign of U.S. President Richard Nixon.
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-gen 
word-forming element technically meaning "something produced," but mainly, in modern use, "thing that produces or causes," from French -gène (18c.), from Greek -genes "born of, produced by," which is from the same source as genos "birth," genea "race, family," from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups. First used in late 18th century French chemistry (see oxygen), it probably involves a misunderstanding of -genes, as though it meant "that which produces."
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-genesis 

word-forming element meaning "birth, origin, creation," from Greek genesis "origin, creation, generation," from gignesthai "to be born," related to genos "race, birth, descent" (from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups).

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-genic 
word-forming element meaning "producing, pertaining to generation;" see -gen + -ic.
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-genous 

word-forming element meaning "generating, producing, yielding;" see -gen + -ous. In modern formations, making adjectives corresponding to words in -gen. In some older words, from Late Latin -genus, from Latin -gena "born" (for example indigenous).

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-geny 
word-forming element meaning "genesis, origin, mode of production," forming corresponding abstract nouns to words in -gen, from French -génie and Modern Latin -genia, from Greek -geneia, from -genes "born, produced," the form in compounds of genos, from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups.
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geo- 

word-forming element meaning "earth, the Earth," ultimately from Greek geo-, combining form of Attic and Ionic "the earth, land, a land or country" (see Gaia).

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