bivial (bivial)

[L. bivius (see bivious ) + -al. Cf. trivial.] 1. Going in two directions.-2. In echinoderms, of or pertaining to the bivium: as, the bivial (posterior) ambulacra. Huxley. bivioust (biv'i-us), a. [ Bivious theorems, and Janus-faced doctrines. Sir T. Browne, Christ. Mor., ii. 3. IMG:content-2125.png:[blocks in formation] Same as viscacha . An obsolete form of bezel . see bivious.] In echinoderms, the ambulacra of the two posterior arms or rays taken together and distinguished from the three anterior rays collectively. See trivium, and cut under Spa tangoida. In the fo il genus Dysaster this separation of the ambulacra into trivium and bivium exists naturally. Huxley, Anat. Invert., p. 488.