/ Dictionary / Index O objective prism: Meaning and Definition of Find definitions for: objec'tive prism' Pronunciation: [key] — Astron. Astron. a large prism placed in front of the objective lens or mirror of a telescope, allowing the simultaneous acquisition of the spectra of many stars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. objective lens objective relativism 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