/ Dictionary / Index B batholith: Meaning and Definition of Find definitions for: bath•o•lith Pronunciation: (bath'u-lith), [key] — n. Geol. a large body of intrusive igneous rock believed to have crystallized at a considerable depth below the earth's surface; pluton. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: batholith (Thesaurus) batho- bathometer Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language