Lewis & Short

pectŏrōsus, a, um, adj. [pectus], with a large or high breast, full-breasted, broadbreasted: sint ergo matrices quadratae, pectorosae, magnis capitibus, Col. 8, 2, 8; Plin. 14, 22, 28, § 140: nemo est feroci pectorosior Marte, Auct. Priap. 37.