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Definition of: theca
(thē′kə) noun plural ·cae (-sē)
1. A sheath or case.
2. Anat. The investment of the spinal cord formed by the dura mater, sometimes called theca vertebralis.
3. Bot. A spore case, sac, or capsule. [<L <Gk. thēkē case]
—the′cal adjective
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