LATIN DICTIONARYLexicon Latīnum
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“oh” in Latin

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

oh
oh! (of internal emotion): pro! or proh! (of astonishment and lamentation): hem! (usually denoting astonishment): The interjections are mostly followed by an accusative (rarely by a dative), oh! good heavens! proh dii immortales! deos immortales! pro Deum fidem! me miserum! oh that! o si! o utinam! or simply utinam! Followed by a subjunctive present, imperfect or pluperfect; but with this difference, that the present is used to denote the earnest desire of the party wishing, while the imperfect and pluperfect imply a condition or doubt; e.g., utinam veniat, I (earnestly) wish he may come; utinam veniret, I wish (it were possible that) he might come.

Quick answer

What is the Latin word for oh?
The usual Latin words for “oh” are prō, hem. 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.