Lewis & Short

sēmĭnālis, e, adj [semen], of or belonging to seed, good for seed, seminal (late Lat.): vicia, Col. 11, 2, 76: membrum, Auct. Priap. 26, 2; cf. venae, Lact. Opif. Dei, 12: viae, Cael. Aur. Acut. 3, 18, 180: vascula, Theod. Prisc. 4, 2: vita, vegetable, Claud. Mam. Stat. Anim. 1, 21.
Plur. subst.: sē-mĭnālia, n., standing crops, Tert. adv. Marc. 13 fin.