[ ak-tuh-nl, ak-tahyn-l ]
/ ˈæk tə nl, ækˈtaɪn l /

adjective Zoology.

having tentacles or rays.
pertaining to the oral area from which the arms or tentacles radiate.

Origin of actinal

1857; actin- + -al1; coined, with sense of def. 2, by Louis Agassiz

Related forms

ac·ti·nal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for actinal

British Dictionary definitions for actinal


/ (ˈæktɪnəl, ækˈtaɪnəl) /


of or denoting the oral part of a radiate animal, such as a jellyfish, sea anemone, or sponge, from which the rays, tentacles, or arms grow
possessing rays or tentacles, as a jellyfish

Derived Forms

actinally, adverb

Word Origin for actinal

C19: see actino-, -al 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012