/ Dictionary / Index S spinaceous: Meaning and Definition of Find definitions for: spi•na•ceous Pronunciation: (spi-nā'shus), [key] — adj. pertaining to or of the nature of spinach; belonging to the goosefoot family of plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spina bifida spinach Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language