LATIN DICTIONARYLexicon Latīnum
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“portent” in Latin

The English word portent itself goes back to Latin portendō, through portentum.

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

portent
ostentum: prodigium: portentum (astonishing appearance, foretelling what is about to happen): signum (any sign, σημεῖον): a frightful portent, objecta res terribilis. Sometimes species nova atque insolita. Vid: PRODIGY.

Quick answer

What is the Latin word for portent?
The usual Latin words for “portent” are ostendō, prōdigium, portendō; also signum. 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.