LATIN DICTIONARYLexicon Latīnum
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“plummet” in Latin

The English word plummet itself goes back to Latin plumbum.

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

plummet
perpendiculum (a mason’s plummet; Vid: Cic., 2 Verr., 1, 51, 133; ad Quint., Fr., 3, 1, 1, § 2): perpendiculum nauticum (Dan.): cataprorates (the lead used at sea; Lucilius, ap. Isidor., 19, 4, § 10; Lindem. ☞ Catapirates is a false reading). To learn to use the plummet, perpendiculo uti discere: to try anything with the plummet, ad perpendiculum exigere aliquid: made straight by the plummet, ad perpendiculum directus.

Quick answer

What is the Latin word for plummet?
The usual Latin words for “plummet” are perpendiculum, Lūcīlius. 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.