/ Dictionary / Index J Jeffreys: Meaning and Definition of Find definitions for: Jef•freys Pronunciation: ( jef'rēz), [key] — n. (1st Baron Jeffreys of Wem), 1648–89, English jurist. born 1891, British geophysicist and astronomer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jeffrey pine Jeffries Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language