a. [ Cf. F. éruptif. ] 1. Breaking out or bursting forth. [ 1913 Webster ]
The sudden glance Appears far south eruptive through the cloud. Thomson. [ 1913 Webster ]
2. (Med.) Attended with eruption or efflorescence, or producing it; as, an eruptive fever. [ 1913 Webster ]
3. (Geol.) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic. [ 1913 Webster ]
n. (Geol.) An eruptive rock. [ 1913 Webster ]