01 a. Pouring out; pouring forth freely.
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1.
Pouring out; pouring forth freely.[archaic]
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2.
formed by an outpouring of molten lava, or pertaining to rocks so formed.(Geol.)
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3.
overly demonstrative; expressing emotion in an unrestrained manner; exhibiting unrestrained enthusiasm; -- of people and human actions; as, effusive thanks; an effusive letter of recommendation. Contrasted with reserved.
Phrases & compounds
Effusive rocks —
volcanic rocks formed by a nonexplosive outpouring of lava in molten or plastic form; in distinction from so-called intrusive, or plutonic, rocks.