LATIN DICTIONARYLexicon Latīnum
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“extraneous” in Latin

The English word extraneous itself goes back to Latin exter, through extrāneus.

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

extraneous
extraneus (very seldom extranea aliqua causa, Auct. ad Her.): externus: adventicius. (The words are found in this connection and order.) externus et adventicius.

Quick answer

What is the Latin word for extraneous?
The usual Latin words for “extraneous” are extrāneus, externus, adventīcius. 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.