LATIN DICTIONARYLexicon Latīnum
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“son” in Latin

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

son
(with reference to parents)(with reference to parents), filius (opposed to puella): (with reference to sex) puer: sexus virilis (also of several sons, Nep.): stirps virilis (also of all the sons of a family collectively, Liv.): so also suboles virilis (Tac.). ☞ In the poets, and also in Quint., we find natus or gnatus for filius, but it is never thus used as a substantive by the best prose writers; so that we cannot say natus meus, tuus, etc., for filius meus, tuus, etc.; or nati parentum for liberi parentum. In Cic., Amic., 8, 27, and De Fin., 5, 25, 65, natus is used as a participle. A young son, little son, filiolus; filius parvus: to have a son, another son, filio, filiolo augeri (Cic.); sexu, stirpe virili augeri (after Liv. and Tac.): to be anybody’s son, aliquo natum, prognatum esse (Liv.); aliquo ortum esse (Cic.): to lose a son, filium amittere, perdere: to leave no son, sexum virilem non relinquere (Nep.).

Quick answer

What is the Latin word for son?
The usual Latin words for “son” are fīlia, puer, nātus. 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.