/ Dictionary / Index S sinumbra lamp: Meaning and Definition of Find definitions for: sin•um'bra lamp" Pronunciation: (si-num'bru), [key] an unshaded sperm-oil lamp consisting of a translucent glass globe supported on a pedestal: a form of astral lamp. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sinuiju sinuosity Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language