/ Dictionary / Index S subtangent: Meaning and Definition of Find definitions for: sub•tan•gent Pronunciation: (sub-tan'junt), [key] — n. Geom. the part of the x-axis cut off between the ordinate of a given point of a curve and the tangent at that point. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subsystem subteen Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language