The Collaborative International Dictionary of English v.0.48:

Eruptive \E*rup"tive\, a. [Cf. F. ['e]ruptif.]
   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]

The Collaborative International Dictionary of English v.0.48:

Eruptive \E*rup"tive\, n. (Geol.)
   An eruptive rock.
   [1913 Webster]

WordNet (r) 3.0 (2006):

eruptive
    adj 1: producing or characterized by eruptions; "an eruptive
           disease"
    2: produced by the action of fire or intense heat; "rocks formed
       by igneous agents" [syn: igneous, eruptive] [ant:
       aqueous, sedimentary]
    3: actively spewing out lava; "a geyser is an intermittently
       eruptive hot spring"

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "eruptive":
   agitable, bursting, detonating, edgy, emotional,
   emotionally unstable, excitable, explodable, explosible, explosive,
   fulminating, high-mettled, high-spirited, high-strung,
   highly emotional, inflammable, irascible, irritable, mettlesome,
   nervous, perturbable, prickly, sensitive, skittish, startlish,
   touchy, volcanic