Etymology
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gymno- 
before vowels gymn-, word-forming element meaning "naked, stripped, bare," from Greek gymnos "naked, unclad; bare, mere," from a metathesis of PIE *nogw-mo-, suffixed form of *nogw- "naked" (see naked).
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gymnosophist (n.)
c. 1400, from Greek gymnosophistai "the naked philosophers," from gymnos "naked" (see naked) + sophistes "wise man" (see sophist). Ancient Hindu holy men whose self-denial extended to clothes; they were known to the later Greeks through the reports of Alexander the Great's soldiers.
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gymnosperm (n.)
1836, from French gymnosperme and Modern Latin gymnospermae (plural, 17c.), literally "naked seed" (i.e., not enclosed in an ovary), from gymno- "naked" + sperma "seed" (see sprout (v.)). Related: Gymnospermous.
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gynaecolatry (n.)
"worship of women," 1888; see gyneco- + -latry "worship of." Related: Gynaecolater; gynaecolatrous.
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gynarchy (n.)

"government by women or a woman," 1570s, from Greek gynē "woman, wife" (from PIE root *gwen- "woman") + -arkhē "rule" (verbal noun of arkhein "to be the first," hence "to rule;" see archon). Synonymous gynaecocracy (from Greek gynaikokratia) and gyneocracy are attested from 1610s; gynocracy is from 1728.

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gyneco- 

also gynaeco-, before a vowel gynec-, word-forming element meaning "woman, female," from Latinized form of Greek gynaiko-, combining form of gynē "woman, female," from PIE root *gwen- "woman." Also see æ (1).

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gynecological (adj.)
also gynaecological, 1858, from gynecology + -ical. Related: Gynecologically.
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gynecology (n.)

also gynaecology, "science of women's health and of the diseases peculiar to women," 1847, from French gynécologie, from Latinized form of Greek gynaiko-, combining form of gynē "woman, female," from PIE root *gwen- "woman." Second element is from French -logie "study of," from Greek (see -logy). Another word for it was gyniatrics.

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gynecomastia (n.)
also gynaecomastia, gynecomasty, "condition of a man having breasts like a woman's," 1881, from gyneco- "woman, female" + Latinized form of Greek mazos "breast," variant of mastos (see masto-) + abstract noun ending -ia.
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