Ef*fu"sive (?), a.
Pouring out; pouring forth freely.
"Washed with the
effusive wave."
Pope.
Effusive rocks Geol., volcanic rocks, in distinction from so-called intrusive, or plutonic, rocks.
-- Ef*fu"sive*ly, adv. -- Ef*fu"sive*ness, n.
© Webster 1913.