/ Dictionary / Index V vermiculite: Meaning and Definition of Find definitions for: ver•mic•u•lite Pronunciation: (vur-mik'yu-līt"), [key] — n. any of a group of platy minerals, hydrous silicates of aluminum, magnesium, and iron, that expand markedly on being heated: used in the expanded state for heat insulation and as a plant growth medium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vermiculite (Thesaurus) vermicule vermiculture Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language