say it: BAHY-uh-tahyt
biotite is a noun meaning "dark brown to black mica found in igneous and metamorphic rock". It is pronounced /ˈbaɪəˌtaɪt/ — BAHY-uh-tahyt. It carries one recorded sense.
dark brown to black mica found in igneous and metamorphic rock
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 biotite 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.