LATIN DICTIONARYLexicon Latīnum
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“breast” in Latin

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

breast
pectus, thorax; praecordia (the cavity of the chest, with the heart and lungs): latus, latera (with reference to the state of the lungs). To receive wounds in the breast (i. e., in front), vulnera adversa accipere or adverse corpore excipere. A breast-wound, vulnus pectoris. A pain in the breast, dolor pectoris, praecordiorom.
The breasts, mammae (especially of human beings): ubera, uberum (especially of brutes). Under the left breast, infra laevam papillam. Having large breasts, mammosus. To put an infant to the breast, mammam infanti dare or praebere. A little breast, mammula:
(as the seat of feeling, etc.) pectus, animus. The furies of the breast, domesticae furiae. But Vid: also BOSOM.
breast v.
pectus opponere alicui rei, alicui rei adverso pectore resistere; obniti, reluctari. Breast the waves, fluctibus (forti pectore) obniti. Breast adversity, fortia pectora adversis rebus opponite (imperative).

Quick answer

What is the Latin word for breast?
The usual Latin words for “breast” are pectus, thōrā̆x, praecordia; also ferō, latus, mamma. 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.