ERUPTIVE
eruptive
(adjective) actively spewing out lava; “a geyser is an intermittently eruptive hot spring”
igneous, eruptive
(adjective) produced by the action of fire or intense heat; “rocks formed by igneous agents”
eruptive
(adjective) producing or characterized by eruptions; “an eruptive disease”
Source: WordNet® 3.1
Etymology
Adjective
eruptive (comparative more eruptive, superlative most eruptive)
That erupts or bursts forth.
Accompanied by eruptions.
(geology) Produced by eruption.
Noun
eruptive (plural eruptives)
An eruptive rock, one produced by eruption.
Source: Wiktionary
E*rup"tive, a. Etym: [Cf. F. éruptif.]
1. Breaking out or bursting forth.
The sudden glance Appears far south eruptive through the cloud.
Thomson.
2. (Med.)
Definition: Attended with eruption or efflorescence, or producing it; as,
an eruptive fever.
3. (Geol.)
Definition: Produced by eruption; as, eruptive rocks, such as the igneous
or volcanic.
E*rup"tive, n. (Geol.)
Definition: An eruptive rock.
Source: Webster’s Unabridged Dictionary 1913 Edition