'Phonolite' definitions:

Definition of 'Phonolite'

From: GCIDE

Phonolite \Pho"no*lite\, n. [Phono- + -lite: cf. F. phonolithe.] (Min.) A compact, feldspathic, igneous rock containing nephelite, ha["u]ynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone. [1913 Webster]