Main Entry: rhy·o·lite

Pronunciation: \ˈrī-ə-ˌlīt\

Function: noun

Etymology: German Rhyolith, from Greek rhyax stream, stream of lava (from rhein) + German -lith -lite

Date: 1868

: a very acid volcanic rock that is the lava form of granite

— rhy·o·lit·ic \ˌrī-ə-ˈli-tik\ adjective