WordReference Random House Unabridged Dictionary of American English © 2025
di•a•stem
(dī′ə stem′),USA pronunciation n. [Geol.]
di′a•stem′ic, adj.
- Geologya minor hiatus in an orderly succession of sedimentary rocks. Cf. unconformity.
- Greek diástēma interval; see diastema
- 1850–55