Definition of Actinal

1. Adjective. (of radiate organisms) located on the surface or end on which the mouth is situated.

Category relationships: Being, Organism
Antonyms: Abactinal

Definition of Actinal

1. a. Pertaining to the part of a radiate animal which contains the mouth.

Definition of Actinal

1. Adjective. (zoology) Pertaining to the side or surface around the mouth in an animal that has radial symmetry such as a starfish. ¹

2. Adjective. (zoology) Pertaining to the axis of rotational symmetry in radiate animals. ¹

¹ Source:

Definition of Actinal

1. having tentacles [adj]

Medical Definition of Actinal

1. Pertaining to the part of a radiate animal which contains the mouth. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998)

Actinal Pictures

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Lexicographical Neighbors of Actinal

actin N-acetylaminopeptidase
actin filament
actin kinase
actinal (current term)
acting out
acting scrum-half
acting scrum-halves
acting up

Literary usage of Actinal

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Cidaridae by Hubert Lyman Clark (1907)
"... in young specimens these white spots project as granules, but in mature specimens, collar is smooth; actinal primaries slightly curved, with a very wide ..."

2. ... Hawaiian and Other Pacific Echini by Alexander Agassiz, Hubert Lyman Clark (1914)
"actinal primary spine; top view. X 2. 4. Tip of small primary spine; side view. X 60. 5-7. ... actinal ambulacral primary spine, from near mouth; side view. ..."

3. Transactions of the Connecticut Academy of Arts and Sciences by Connecticut Academy of Arts and Sciences (1871)
"The actinal cuts arc deep, ... in the former the two inner rows terminate about half way to the actinal area and are separated by a median region of some ..."

4. ... Report on the Echini by Alexander Agassiz (1885)
"Part of actinal system, showing the imbricated plates in a young ... uear the actinal extremity in each of the ambulacral areas. Fig. 8. ..."

5. Quarterly Journal of Microscopical Science edited by Biologists Limited, The Company of. (1880)
"Although developed on the dorsal surface of the larva the water-pore is usually on the actinal surface of the adult ; while in ..."

6. Forms of Animal Life: A Manual of Comparative Anatomy : with Descriptions of by George Rolleston, William Hatchett Jackson (1888)
"To form the arms they fuse with five similarly arranged processes of the left side, ie the ventral or actinal surface here. Both sets of processes may be ..."

7. Proceedings of the Davenport Academy of Sciences by Davenport Academy of Sciences (1883)
"Plates of such enormous dimensions as are found occasionally among the deltoids, cannot possibly form a part of the actinal system in so low a group as the ..."

8. Circulars by Johns Hopkins University, Stanford University (1900)
"250 mm. across, of a dark olive green or a purplish color above, with irregular yellowish bands across the rays, and the actinal surface entirely yellow. ..."

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