Definify.com
Webster 1913 Edition
Actinal
Ac′ti-nal
,Adj.
[Gr. [GREEK], [GREEK], ray.]
(Zool.)
Pertaining to the part of a radiate animal which contains the mouth.
L. Agassiz.
Definition 2024
actinal
actinal
English
Adjective
actinal
- (zoology) Pertaining to the side or surface around the mouth in an animal that has radial symmetry such as a starfish.
- 1857, Professor Louis Agassiz, Natural History of North America, Vol. IV, page 376,
- The so-called mouth is always placed at one of these poles, and from it radiate the most prominent organs, in consequence of which I have called this side of the body the oral or actinal area ...
- 1857, Professor Louis Agassiz, Natural History of North America, Vol. IV, page 376,
- (zoology) Pertaining to the axis of rotational symmetry in radiate animals.
- 1861, John Timbs, Charles W. Vincent, James Mason, The Year-book of Facts in Science and Art, Simpkin, Marshall, and Co., page 214,
- [Professor Agassiz] gives the names of two axes of the animals; that around which the motion of the animal occurs is the actinal axis ...
- 1861, John Timbs, Charles W. Vincent, James Mason, The Year-book of Facts in Science and Art, Simpkin, Marshall, and Co., page 214,