definition of the word abactinal

by the Wiktionnary

abactinal (comparative more abactinal, superlative most abactinal)

Positive
abactinal

Comparative
more abactinal

Superlative
most abactinal

(zoölogy) Pertaining to the surface or end opposite to the mouth in a radiate animal; -- opposed to actinal.

The aboral or abactinal area. - L. Agassiz

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