(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.).