/ Dictionary / Index A actinal: Meaning and Definition of Find definitions for: ac•ti•nal Pronunciation: (ak'tu-nl, ak-tīn'l), [key] — adj. Zool. having tentacles or rays. pertaining to the oral area from which the arms or tentacles radiate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actinal (Thesaurus) actin acting Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language