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In Old English the words wer and wyf (also wæpman and wifman) were what was used to refer to "a man" and "a woman" respectively, and "Man" was gender neutral. In Middle English man displaced wer as term for "male human", whilst wyfman (which eventually evolved into woman) was retained for "female human". ("Wyf" also evolved into the word "wife".) "Man" does continue to carry its original sense of "Human" however, resulting in an asymmetry sometimes criticized as sexist.^[1] (See also Womyn.)

Source from : http://en.wikipedia.org/wiki