trachyte noun. ['treɪkʌɪt, 'trakʌɪt] E19.
[from Greek trakhus rough or trakhutēs roughness: cf. -ITE¹.]
Geology. Orig., any of a group of volcanic rocks having a characteristically rough or gritty surface. Now spec. any fine-grained volcanic rock of the alkaline series of intermediate rocks.

■ trachytic [trǝ'kɪtɪk] adjective consisting of, of the nature of, or containing trachyte E19.

[TahlilGaran] English Dictionary ▲