LATIN DICTIONARYLexicon Latīnum
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“perch” in Latin

The English word perch itself goes back to Latin pertica.

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

perch s.
A pole, pertica; decempeda, -ae (as a measuring rod): a little peach, pertica pusilla.
A certain measure, pertica (Frontin.; because the land was measured with a pole, pertica).
A certain fish, perca (Plin.).
perch v.
(arbori) insidere, considere (of several); (in arbore) sedere.

Quick answer

What is the Latin word for perch?
The usual Latin words for “perch” are pertica, decempeda, perca; also īnsideō, cōnsīdō, sedeō. 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.