LATIN DICTIONARYLexicon Latīnum
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“wane” in Latin

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

wane s.
deminutio luminis: (luna) senescens or decrescens (Cic.): (lunae) decrescentia (Vitr.).
wane v.
decrescere (of the moon, Cic.): deminui (to diminish). Vid: also, DECLINE.

Quick answer

What is the Latin word for wane?
The usual Latin words for “wane” are senēscō, dēcrēscō, dēminuō. 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.