LATIN DICTIONARYLexicon Latīnum
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“fatten” in Latin

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

fatten
TRANS., saginare (to feed with anything that will produce fatness): pinguem facere (to make fat): opimare (of birds, especially): farcire (to cram with anything, only of fowls). To fatten with anything, alere aliqua re (e.g., with bran, furfuri): to be good for fattening, conferre ad adipes creandas (or creandos); pinguitudinem efficere (e.g., a hog, sui).
INTRANS., pinguescere (to become or grow fat): nitescere (to be sleek, etc.).

Quick answer

What is the Latin word for fatten?
The usual Latin words for “fatten” are sagīnō, farciō, pinguēscō; also nitēscō, furfur. 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.