LATIN DICTIONARYLexicon Latīnum
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“louse” in Latin

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

louse s.
pediculus; pedis (Plaut.). To be eaten up with lice, pediculorum multitudine corpori innascentium animam efflare (after Plin., 7, 51, 52).
louse v.
*liberare aliquem pediculis; *pediculos alicui legere.

Quick answer

What is the Latin word for louse?
The usual Latin words for “louse” are pediculus, pēs. 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.