Tephrite
Pronunciation : Teph"rite
Part of Speech : n.
Etymology : [Gr. (Geol.)
Definition : Defn: An igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder