the·ca (th  k )n. pl. the·cae (-s  , -k) A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects. [Latin th ca, case, receptacle, from Greek thk; see dh- in Indo-European roots.]the cal (-kl) adj. |
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