/ Dictionary / Index T tachiol: Meaning and Definition of Find definitions for: tach•i•ol Pronunciation: (tak'ē-ôl", -ol"), [key] — n. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ta Ch'ing tachism Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language