LATIN DICTIONARYLexicon Latīnum
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“ounce” in Latin

The English word ounce itself goes back to Latin ū̆ncia.

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

ounce
uncia. Weighing an ounce, uncialis (Plin.): half an ounce, semuncia: an ounce and a half, sescuncia (= sesquicuncia): two ounces, sextans: three ounces, triens: four ounces, quadrans: five ounces, quincunx: six ounces, semis, -issis, m.: seven ounces, septunx: eight ounces, bes, bessis, m.: nine ounces, dodrans: ten ounces, dextans: eleven ounces, deunx: twelve ounces, as, assis, m.

Quick answer

What is the Latin word for ounce?
The usual Latin words for “ounce” are unciālis, sēmū̆ncia, sēscū̆ncia; also sextāns, triēns, quadrō. 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.