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What does actinal mean?

Looking for the meaning or definition of the word actinal? Here's what it means.

Adjective
  1. (zoology) Pertaining to the side or surface around the mouth in an animal that has radial symmetry such as a starfish.
  2. (zoology) Pertaining to the axis of rotational symmetry in radiate animals.
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Examples
The plane of the actinal surface at first meets that of the abactinal at an acute or nearly right angle.
The larval mouth is transported into the centre of the actinal disc.
It is situated on the actinal or ventral surface of the future starfish, and is related to the left peritoneal vesicle.

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