Phenocryst

1 definition found

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

  Phenocryst \Phe"no*cryst\, n. [Gr. fai`nesqai to appear +
     kry`stallos crystal.] (Geol.)
     One of the prominent embedded crystals of a porphyry.
     [Webster 1913 Suppl.]