Etymology
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tomboy (n.)

1550s, "rude, boisterous boy," from Tom + boy; meaning "wild, romping girl, girl who acts like a spirited boy" is first recorded 1590s. It also could mean "strumpet, bold or immodest woman" (1570s). Compare tomrig "rude, wild girl." Related: Tomboyish.

updated on February 11, 2014

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Definitions of tomboy from WordNet

tomboy (n.)
a girl who behaves in a boyish manner;
Synonyms: romp / hoyden
From wordnet.princeton.edu, not affiliated with etymonline.