/ Dictionary / Index O orthosis: Meaning and Definition of Find definitions for: or•tho•sis Pronunciation: (ôr-thō'sis), [key] — pl. -ses the correction of orthopedic maladjustments. an orthotic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoselection orthostat Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language