thecal

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the·ca

 (thē′kə)
n. pl. the·cae (-sē′, -kē′)
A case, covering, or sheath, such as the covering of the pollen sacs of an anther or the thick cell wall of certain dinoflagellates.

[Latin thēca, case, receptacle, from Greek thēkē; see dhē- in Indo-European roots.]

the′cal (-kəl) adj.