Etymology
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half-moon (n.)

1520s; from half + moon (n.).

updated on October 10, 2017

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Definitions of half-moon from WordNet

half-moon (n.)
the crescent-shaped area at the base of the human fingernail;
Synonyms: lunula / lunule
half-moon (n.)
the time at which the Moon is at first or last quarter when half its face is illuminated;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.