LATIN DICTIONARYLexicon Latīnum
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“observer” in Latin

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

observer
observator (general term; ☞ post-Augustan): spectator (a beholder): speculator (a spy); or by circumlocution with the verbs: an observer of nature, speculator venatorque naturae: an observer of the constellations, spectator caeli siderumque: an acute observer, homo acutus, sagax, emunctae naris homo (facete, Hor., Sat., 1, 4, 8): a careful observer of his duties, omnium officiorum observantissimus (Plin., Ep. 10, 11): to be a diligent observer of anything, acriter animum intendere ad aliquid; acrem et diligentem esse animadvertorem alicujus rei.

Quick answer

What is the Latin word for observer?
The usual Latin words for “observer” are observō, spectō, speculātor; also sagāx, facētus. 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.