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“species” in Latin

The English word species itself goes back to Latin speciō, through speciēs.

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

species
pars (opposed to genus; Cic., De Invent., 1, 28, 42, genus est, quod partes aliquas amplectitur, ut cupiditas; pars est, quae subest generi, ut amor); more rarely, species (in logic): species (Cic., Top., 7, 31; in natural history): forma.

Quick answer

What is the Latin word for species?
The usual Latin words for “species” are pars, speciēs, fōrma. 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.