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1. Breaking out or bursting forth. The sudden glance Appears far south eruptive through the cloud. (Thomson)
2. (Science: medicine) Attended with eruption or efflorescence, or producing it; as, an eruptive fever.
3. (Science: geology) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic.
Origin: cf. F. Eruptif.
(Science: geology) An eruptive rock.