Lewis Short
būmastus | būmasta, ae (noun F) : (, , Edict. Diocl. p. 18), , = βούμαστος, sc. ἄμπελος (having large breasts; cf.
* Bumammus),a species of grape with large clusters,Verg. G. 2, 102 and Serv. ad loc.; id. Cul. 405; Col. 3, 2, 1; cf.: tument mammarum modo bumasti (acini),Plin. 14, 1, 3, § 15; 14, 3, 4, § 42.
Charlton T. Lewis, Charles Short, A Latin Dictionary