Rhyolite

[raiәlait]

Definition

(noun.) very acid volcanic rock.

Checked by Kathy--From WordNet

Definition

(n.) A quartzose trachyte, an igneous rock often showing a fluidal structure.

Typed by Garrett

Definition

n. an igneous rock called also Liparite and Quartz-trachyte.—adj. Rhyolit′ic.

Checker: Truman