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“brim” in Latin

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

brim
margo: ora (the former as a line, the latter as a space, especially of a border, an ornamental, or at least artificial, edging): labrum (PROP. “lip,” the edge, brim, etc., of something hollow). Brim of a cup, poculi orae or labra.
Upper surface, summus, with a substantive.

Quick answer

What is the Latin word for brim?
The usual Latin words for “brim” are margō, ōs, labrum; also superus. 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.