noun, plural spinae [spahy-nee] . Anatomy, Zoology.
a spine or spinelike projection.

1350–1400; Middle English < Latin spīna thorn, backbone; see spine

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Medical Dictionary

spina spi·na (spī'nə)
n. pl. spi·nae (-nē)
A spine-shaped or sharp thornlike anatomical process.

The American Heritage® Stedman's Medical Dictionary
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