LATIN DICTIONARYLexicon Latīnum
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“oak” in Latin

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

oak
quercus (the common or forest oak): cerrus (the Turkey or Burgundy oak): ilex (the holm-oak): quercus esculus (or simply esculus; the mast-tree): oak-timber, lignum quernum; ligna roborea, materies roborea (of the holly): oak-apple, galla (Plin., not used in the plur.).

Quick answer

What is the Latin word for oak?
The usual Latin words for “oak” are quercus, cerrus, īlex; also Gallus. 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.