*erupt*

v. i. [ See eruption. ] 1. To eject something, esp. lava, water, etc., as a volcano or geyser; as, when Mount Saint Helens erupted, some people were taken by surprise. [ Webster 1913 Suppl. +PJC ]

2. To burst forth; to break out, as ashes from a volcano, teeth through the gums, etc.; as, the third molar erupts late in most people, and in some persons does not occur at all. [ Webster 1913 Suppl. +PJC ]

When the amount and power of the steam is equal to the demand, it erupts with violence through the lava flood and gives us a small volcano. H. J. W. Dam. [ Webster 1913 Suppl. ]

adj. prenom. currently undergoing eruption; -- of volcanoes. [ WordNet 1.5 ]

n. [ L. eruptio, fr. erumpere, eruptum, to break out; e out + rumpere, to break: cf. F. éruption. See Rupture. ] 1. The act of breaking out or bursting forth; as: (a) A violent throwing out of flames, lava, etc., as from a volcano or a fissure in the earth's crust. (b) A sudden and overwhelming hostile movement of armed men from one country to another. Milton. (c) A violent commotion. [ 1913 Webster ]

All Paris was quiet . . . to gather fresh strength for the next day's eruption. W. Irving. [ 1913 Webster ]

2. That which bursts forth. [ 1913 Webster ]

3. A violent exclamation; ejaculation. [ 1913 Webster ]

He would . . . break out into bitter and passionate eruditions. Sir H. Wotton. [ 1913 Webster ]

4. (Med.) The breaking out of pimples, or an efflorescence, as in measles, scarlatina, etc. [ 1913 Webster ]

a. Eruptive. [ R. ] R. A. Proctor. [ 1913 Webster ]

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 ]