/ Dictionary / Index T tractrix: Meaning and Definition of Find definitions for: trac•trix Pronunciation: (trak'triks), [key] — pl. trac•tri•ces a curve whose tangents are all of equal length; the involute of a catenary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tractor-trailer tract society Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language