/ Dictionary / Index T thoroughpin: Meaning and Definition of Find definitions for: thor•ough•pin Pronunciation: (thûr'ō-pin", -u-pin", thur'-), [key] — n. Vet. Pathol. an abnormal swelling just above the hock of a horse, usually appearing on both sides of the leg and sometimes causing lameness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thoroughpaced thoroughwort Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language