[ak-tuh-nl, ak-tahyn-l]

Origin of actinal

1857; actin- + -al1; coined, with sense of def. 2, by Louis Agassiz
Related formsac·ti·nal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for actinal

Historical Examples of actinal

British Dictionary definitions for actinal


  1. 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
  2. possessing rays or tentacles, as a jellyfish
Derived Formsactinally, adverb

Word Origin for actinal

C19: see actino-, -al 1
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