- zoology (of organisms showing radial symmetry) situated away from or opposite to the mouth; aboral
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for abactinal
These two series also differ from each other in the relations of the abactinal nerve-system.
The plane of the actinal surface at first meets that of the abactinal at an acute or nearly right angle.
The abactinal disc now also grows out into five short processes, separated by five shallow notches.