'Chert' definitions:
Definition of 'chert'
From: WordNet
noun
Variety of silica containing microcrystalline quartz
Definition of 'Chert'
From: GCIDE
- Chert \Chert\ (ch[~e]rt), n. [Ir. ceart stone, perh. akin to E. crag.] (Min.) An impure, massive, flintlike quartz or hornstone, of a dull color. [1913 Webster]
Definition of 'chert'
From: GCIDE
- Hornstone \Horn"stone`\, n. (Min.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert. [1913 Webster]