/ Dictionary / Index S spinous: Meaning and Definition of Find definitions for: spi•nous Pronunciation: (spī'nus), [key] — adj. covered with or having spines; thorny, as a plant. armed with or bearing sharp-pointed processes, as an animal. spinelike. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spinous (Thesaurus) spinose spinous process Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language