LATIN DICTIONARYLexicon Latīnum
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“chestnut” in Latin

The English word chestnut itself goes back to Latin castanea.

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

chestnut
castanea (the tree): (nux) castanea (the fruit). Horse-chestnut, *aesculus hippocastanum. Chestnut (of color), badius, spadix. A chestnut-grove, castanetum.

Quick answer

What is the Latin word for chestnut?
The usual Latin words for “chestnut” are castanea, badius, spādīx; also castanētum. 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.