Etymology
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unsex (v.)
"deprive of the qualities considered typical of one's gender," c. 1600, from un- (2) "reverse, opposite of" + sex (n.). Related: Unsexed; unsexing.
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neuter (adj.)

late 14c., neutre, in grammar, of nouns, pronouns, etc., "neither masculine nor feminine in gender," also of verbs, "having middle or reflexive meaning, neither active nor passive," from Latin neuter "of the neuter gender," literally "neither one nor the other," from ne- "not, no" (from PIE root *ne- "not") + uter "either (of two)" (see whether). The Latin word is probably a loan-translation of Greek oudeteros "neither, neuter." From 1520s it also had the sense of "taking neither side" which now generally goes with neutral (adj.).

As a noun from mid-15c., "the neuter gender;" by 1797 of certain animals (among bees, ants, etc.) that are of neither sex and incapable of generation.

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omnisexual (adj.)

"pansexual; sexually, romantically, or emotionally attracted to people regardless of their sex or gender," by 1959, from omni- "all, every" + sexual. Earliest application is to Walt Whitman.

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oneself 

1540s, one's self, "a person's self" (without distinction of gender), an emphatic form of one, with self. Hyphenated 18c.; written as one word from c. 1827, on model of himself, herself, myself, itself, etc.

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neutral (n.)

mid-15c., "one who takes no part in a contest between others, one who has a neutral opinion," from Latin neutralis "of neuter gender," (see neutral (adj.)). Meaning "disengaged position in gear mechanisms" is by 1905.

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suffragist (n.)
1822, "advocate of extension of the political franchise in Britain," without regard to gender, or, in the U.S., of voting rights for free blacks; from suffrage + -ist. After c. 1885 especially with reference to voting rights for women.
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kin (n.)

c. 1200, from Old English cynn "family; race; kind, sort, rank; nature" (also "gender, sex," a sense obsolete since Middle English), from Proto-Germanic *kunja- "family" (source also of Old Frisian kenn, Old Saxon kunni "kin, kind, race, tribe," Old Norse kyn, Old High German chunni "kin, race;" Danish kjön, Swedish kön, Middle Dutch, Dutch kunne "sex, gender;" Gothic kuni "family, race," Old Norse kundr "son," German Kind "child"), from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups.

In the Teutonic word, as in Latin genus and Greek [genos], three main senses appear, (1) race or stock, (2) class or kind, (3) gender or sex .... [OED]

Related to both words kind and to child. From 1590s as an adjective, from the noun and as a shortening of akin. Legal next of kin (1540s) does not include the widow, "she being specifically provided for by the law as widow" [Century Dictionary], and must be a blood relation of the deceased.

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merman (n.)

"fabulous sea-creature, man above and fish below," c. 1600, literally "man of the sea," from first element in mermaid (q.v.) + man (n.). The gender-neutral merpeople (1849 "Kit Bam's Adventures") and merfolk (1846) "inhabitants of the sea with human bodies and fish-like tails" seem to be more recent formations.

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male (n.)

late 14c., "male human being; male fish or land animal; one of the sex that begets young," from Old French masle (adj.) "masculine, male, adult," also used as a noun (12c., Modern French mâle), from Latin masculus "masculine, male, worthy of a man" (source also of Provençal mascle, Spanish macho, Italian maschio), diminutive of mas (genitive maris) "male person or animal, male."

Male, matching female, applies to the whole sex among human beings and gender among animals, to the apparel of that sex, and, by figure, to certain things, as plants, rimes, cesuras, screws, joints. Masculine, matching feminine, applies to men and their attributes and to the first grammatical gender; a woman may wear male apparel and have a masculine walk, voice, manner, temperament. [Century Dictionary, 1895]
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barista (n.)
"bartender in a coffee shop," as a purely English word in use by 1992, from Italian, where it is said to derive ultimately from English bar (n.2), as borrowed into Italian. The word is of generic gender and may be applied with equal accuracy to women and men (it is said that the typical barista in Italy is a man).
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