/ Dictionary / Index U ultisol: Meaning and Definition of Find definitions for: ul•ti•sol Pronunciation: (ul'tu-sôl", -sol"), [key] — n. a weathered, red and yellow acidic soil of warm, humid areas that is agriculturally productive when treated with lime and organic fertilizers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultimogeniture ulto. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language