actinal

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

Phonetic (Standard)IPA

adjective

, Zoology.

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

Origin of actinal¹

1857; actin- + -al ¹; coined, with sense of actinal def 2, by Louis Agassiz

Origin of actinal¹

C19: see actino- , -al ¹

It is situated on the actinal or ventral surface of the future starfish, and is related to the left peritoneal vesicle.

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.

April 19, 2024tortuous

[tawr-choo-uhs ]

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