spi'na, gen. and pi..?^t'«iK

[L. a thorn.] i The spine. 2. Any spine or sharp thorn-like proce , s. angula'ris [BNA], angular spine, spinous proce of the sphenoid bone, alar or sphenoidal spine, the posterior prolongation of the wing of the sphenoid bone on either side. s. bifid a, a limited defect in the spinal column, consisting in absence of the vertebral arches, through which the spinal membranes, with or without spinal-cord ti ue, protrude, s. bifid a occul'ta, a form in which there is a spinal defect, but little or no protrusion of the cord or its membranes; the site of the defect is sometimes indicated by a growth of hair, s, dorsa'lis, the spinal column, s. front a'lis [BNA].