/ Dictionary / Index U undersoil: Meaning and Definition of Find definitions for: un•der•soil Pronunciation: (un'dur-soil"), [key] — n. subsoil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undersoil (Thesaurus) underslung undersparred Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language