[1] : The Collaborative International Dictionary of English v.0.48

effusive \effu"sive\, a.
   1. pouring out; pouring forth freely. archaic "washed with
      the effusive wave." --pope.
      1913 webster

   2. geol. formed by an outpouring of molten lava, or
      pertaining to rocks so formed.
      pjc

   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. wordnet sense 1+2

   syn: gushing, gushy, burbling, burbly. pjc

   effusive rocks geol., volcanic rocks formed by a
      nonexplosive outpouring of lava in molten or plastic form;
      in distinction from so-called intrusive, or plutonic,
      rocks. -- effu"sively, adv. -- effu"siveness, n.
      1913 webster
see also:
reserved effusive rocks intrusive plutonic effu"sively effu"siveness 

Effusive >> E Words
Effusive, definition of term: Effusive
effusive_pag1.html

Rocks >> R Words
Rocks, definition of term: Rocks
rocks_pag1.html

Plutonic Rocks >> P Words
Plutonic Rocks, definition of term: Plutonic Rocks
plutonic+rocks_pag1.html