Abactinal
adjective
(zoology) (of organisms showing radial symmetry) situated away from or opposite to the mouth; aboral
historical examples
the plane of the actinal surface at first meets that of the abactinal at an acute or nearly right angle.
the works of francis maitland balfour, volume ii (of 4) francis maitland balfour
these two series also differ from each other in the relations of the abactinal nerve-system.
encyclopaedia britannica, 11th edition, volume 8, slice 10 various
the abactinal disc now also grows out into five short processes, separated by five shallow notches.
the works of francis maitland balfour, volume ii (of 4) francis maitland balfour
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