Search Result for "crystallite": 
Wordnet 3.0

NOUN (1)

1. any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock;


The Collaborative International Dictionary of English v.0.48:

Crystallite \Crys"tal*lite\ (kr?s"tal-l?t), n. [See Crystal.] (Min.) A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc. [1913 Webster]
WordNet (r) 3.0 (2006):

crystallite n 1: any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock