LATIN DICTIONARYLexicon Latīnum
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“swift” in Latin

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

swift adj.
citus: celer: velox: swift of foot, pernix: pedibus celer (☞ celeripes is poetical): a swift horse, equus celer or velox. Vid. QUICK, RAPID.
swift s.
A bird, apus (Plin.); *hirundo apus (Linn.).

Quick answer

What is the Latin word for swift?
The usual Latin words for “swift” are citus, celer, vēlōx; also pernīx, apūs. 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.