/ Dictionary / Index S spirula: Meaning and Definition of Find definitions for: spir•u•la Pronunciation: (spir'yu-lu, -oo-lu), [key] — pl. -lae any cephalopod of the genus Spirula, having a flat, spiral shell that is partly inside and partly outside the posterior part of the body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spirula (Thesaurus) spirt spirulina Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language