/ Dictionary / Index P Phytin: Meaning and Definition of Find definitions for: Phy•tin Pronunciation: (fī'tin), [key] — Trademark. Trademark. a brand of white, powdered calcium-magnesium salt, obtained from seeds, tubers, and rhizomes: used in the synthesis of inositol and as a calcium supplement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phytic acid phyto- Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language