Main Entry: peg·ma·tite

Pronunciation: \ˈpeg-mə-ˌtīt\

Function: noun

Etymology: French, from Greek pēgmat-, pēgma something fastened together, from pēgnynai to fasten together — more at pact

Date: circa 1828

: a coarse variety of granite occurring in dikes or veins

— peg·ma·tit·ic \ˌpeg-mə-ˈti-tik\ adjective