Breadcrumb Home > Dictionary > Index W wollastonite: Meaning and Definition of Find definitions for: wol•las•ton•ite Pronunciation: (wool'u-stu-nīt"), [key] — n. a mineral, calcium silicate, CaSiO, occurring usually in fibrous white masses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: wollastonite (Thesaurus) Wollaston Wollaston Lake ✖ Related Content Daily Word Quiz: glissade Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language