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say it: PEG-muh-tahyt
pegmatite is a noun meaning "a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements". It carries one recorded sense.
a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for pegmatite come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.