LATIN DICTIONARYLexicon Latīnum
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“barnacle” in Latin

The English word barnacle itself goes back to Latin barnēca.

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

barnacle
a kind of sea-fowl, anser marinus.
A farrier’s instrument, postomis, idis, f.
A sort of spectacles, perspicillum: barnacles had not yet been invented, nondum oculi arte adjuti erant.

Quick answer

What is the Latin word for barnacle?
The usual Latin words for “barnacle” are postŏmis, fīlius, perspicillum. 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.