productive Copy link Outline I. Yielding freelyII. Causing1. effĭciens, ntis (with gen.)2. expr. by sum, with double dat. (L. G. § 267) • productive: I. Yielding freely: fĕrax, ācis (having naturally capacity to yield fruit, whether actually doing so or not): to possess the most p. soil, feracissimos agros possidere, Caes. B. G. 2, 4: Col.: Hor. Foll. by gen.: a soil p. in trees, f. arborum terra, Plin. Ep. 2, 17, 15: also with abl., ib. 4, 15, 8 (saeculum bonis artibus f.): v. fertile. P. of or in, may sometimes be expr. by verb. this age was wonderfully p. in orators, haec aetas effudit copiam [sc. oratorum], Cic. Br. 9, 36 (R. and A.): so, Plin. Ep. 1, 13, 1, magnum proventum poetarum hic annus attulit, Plin. Ep. 1, 13, init.: v. to produce (III.). II. Causing: 1. effĭciens, ntis (with gen.): virtue p. of enjoyment, e. voluptatis virtus, Cic. Off. 3, 33, 116. So effectrix: id. Fin. 2, 17, 55. 2. expr. by sum, with double dat. (L. G. § 267): to be p. of advantage to any one, alicui bono esse, Cic. R. Am. 5, 13: so with fio: to prove p. of disgrace to any one, alicui dedecori fieri, id. Off. 1, 39, 139.