/ Dictionary / Index O oldster: Meaning and Definition of Find definitions for: old•ster Pronunciation: (ōld'stur), [key] — n. an old or elderly person. (in the British navy) a midshipman of four years' standing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oldster (Thesaurus) old stager Old Stoa Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language