Spine
SPINE, noun [Latin]
1. The back bone of an animal.
2. The shin of the leg.
3. A thorn; a sharp process from the woody part of a plant. It differs from a prickle, which proceeds form the bark. A spine which proceeds from the bark. A spine sometimes terminates a branch or a leaf, and sometimes is axillary, growing at the angle formed by the branch or leaf with the stem. The wild apple and pear are armed with thorns; the rose, bramble, gooseberry. etc. are armed with prickles.