LATIN DICTIONARYLexicon Latīnum
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“hollow” in Latin

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

hollow adj.
cavus (both “hollow” and “hollowed out”): concavus (concave; opposed to gibbus). Hollow teeth, dentes concavi (naturally; e.g., the tusks of a boar; opposed to dentes solidi); dentes exesi (decayed; opposed to integri): hollow eyes, lumina cava (†); oculi concavi: hollow cheeks, genae concavae (†).
Of sound, obtusus (opposed to clarus): fuscus (opposed to candidus; also, of voice).
False, unreal, falsus: fictus: simulatus: fallax: fucatus: fucosus (opposed to sincerus, probus; e.g., friendship).
hollow s.
cavum (general term): recessus cavus (hollow recess; deep hollow; e.g., of the situation of the chameleon’s eyes, Plin.): strix: canalis (fluted hollow on a pillar, etc.). A little hollow, cavernula (Plin.). The hollow of the hand, vola (the natural hollow; also of the foot); manus cava or concava (as made; opposed to manus plana; e.g., in “to scoop up water in the hollow of one’s hand”): the hollow of a tree, exesae arboris truncus.
hollow v.
cavare: excavare: exedere (to eat away; of time making a tree hollow, etc.).

Quick answer

What is the Latin word for hollow?
The usual Latin words for “hollow” are cavus, concavus, obtundō; also fuscus, fallō, fingō. 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.