LATIN DICTIONARYLexicon Latīnum
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“contagious” in Latin

The English word contagious itself goes back to Latin contingō, through contagiosus.

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

contagious
pestilens: contagiosus (Veget., but used in modern medicine): a contagious disease, contagio (unclassical, contagium) morbi: pestilentia: vulgatus in homines morbus (of one that has proved itself contagious, Liv.). A contagious example, contactus (e.g., ceterae legiones, contactu bellum meditabantur, Tac.).

Quick answer

What is the Latin word for contagious?
The usual Latin words for “contagious” are pestilēns, contāgiōsus, vegeō; also contāgiō, contāgium, morbus. 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.