/ Dictionary / Index T three-way bulb: Meaning and Definition of Find definitions for: three'-way bulb' Pronunciation: (thrē'wā"), [key] a light bulb that can be switched to three successive degrees of illumination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. three-wattled bellbird three-wheeler Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language