1. a thornlike process or projection.
2. the backbone, or vertebral column. See also spinal.
- cuneal s. — the axial ridge of the upper surface of the frog in the hoof of the horse that projects into the digital cushion.
- iliac s. — small salients along the dorsal and ventral borders of the ilium, divided into cranial and caudal, dorsal and ventral, in cats and dogs, contrasted to the single sacral and coxal tubers in large animals.
- ischial s. — the crest of bone to which the sacrosciatic ligament attaches and which provides the origin of the gluteus profundus muscle.
- plant s's — cause cutaneous laceration and subcutaneous abscess, oral mucosal laceration and ulceration, conjunctival injury.
- scapular s. — the ridge that divides the lateral surface of the scapula into the supraspinous and infraspinous fossae.
