One of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra. -- Zyg`ap*o*phys"i*al, a.
A hydroid coral of the genus Millepora, especially M. alcicornis, of the West Indies and Florida. So called because it stings the tongue like ginger. See Illust. under Millepore.