LATIN DICTIONARYLexicon Latīnum
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“diametrically” in Latin

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

diametrically
per medium (after example from Vitrvius, under DIAMETER).
FIG., prorsus (e.g., dissentire, etc.). Diametrically opposite, valde contrarius (Cic.; sunt enim valde contrarius illa, quae vocantur negantia): tamquam e regione contrarius (Cic.; of things that, though directly opposite, yet correspond, being ex eodem genere): maxime disjunctus atque contrarius (Cic.). Diametrically opposite (things), contraria inter sese: contraria diversaque atque inter se repugnantia (Cic.). To be diametrically opposite (valde or maxime) contraria esse: inter se repugnare [☞ Muretus uses ex diametro pugnare with an ut ajunt; but this should not be imitated.] DIAMOND, adamas: a glazier’s diamond, adamas ferro inclusus: parva adamantis crusta, quae ferro inclusa est (Vid: Plin., 37, 4, 15). As adjective, adamantinus. A diamond cross, *insigne crucis in formam adamantibus distinctus. A diamond ring, *annulus adamante ornatus, fulgens.

Quick answer

What is the Latin word for diametrically?
The usual Latin words for “diametrically” are prōrsus, dissentiō, oppositus; also valdē, maximus. 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.