LATIN DICTIONARYLexicon Latīnum
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“flaccid” in Latin

The English word flaccid itself goes back to Latin flaccus, through flaccidus.

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

flaccid
flaccidus (withered, slack): marcidus (without consistency and solidity; fading away): resolutus (unstrung, etc.; e.g., corpora juvenum, Col.). To become flaccid, flaccessere: marcescere. To be flaccid, flaccere (PROP., Lactantius; but IMPROP., Cic.): marcere. All these expressions are seldom met with in prose writers that have been handed down to us.

Quick answer

What is the Latin word for flaccid?
The usual Latin words for “flaccid” are flaccidus, marcidus, resolvō; also marcēscō, flacceō, Lactantius. 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.