Eruptive
Eruptive , adjective
[Compare French éruptif.]
1.
Breaking out or bursting forth.
The sudden glance
Appears far south eruptive through the cloud.
2.
(Medicine) Attended with eruption or efflorescence, or producing it; as, an eruptive fever.
3.
(Geology) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic.
Eruptive , noun
(Geology) An eruptive rock.