/ Dictionary / Index S sclero-: Meaning and Definition of Find definitions for: sclero- Pronunciation: [key] a combining form meaning “hard,” used with this meaning, and as a combining form ofin the formation of compound words: sclerometer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. scleritis scleroderma Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language