What is the Latin word for half moon?

The usual Latin words for “half moon” are lūna, lūnō. The right choice depends on the sense; see the distinctions below.

English → Latin

“half moon” in Latin

lūnaa moon; moonlight, moon shine; a month lūnōto curve or bend into a crescent or half-moon shape

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

half moon

luna dimidia (PROP., the moon when not quite full, or when no longer full): luna dimidiata (PROP., the moon halved, of which only the half is visible, etc.): luna (any object that has the shape of a crescent; e.g., the Turkish crescent): in the shape of a half moon, lunatus.

Quick answer

What is the Latin word for half moon?: The usual Latin words for “half moon” are lūna, lūnō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.