/ Dictionary / Index S spina: Meaning and Definition of Find definitions for: spi•na Pronunciation: (spī'nu), [key] — pl. -nae a spine or spinelike projection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spin spina bifida 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