noun, plural the·cae [thee-see] /ˈθi si/.
- a sac, cell, or capsule.
- a sporangium.
Origin of theca
Examples from the Web for thecal
Historical Examples of thecal
At the same time the thecal plates degenerated into spicules.
These two types are, in the main, correlated with two gradual differentiations in the minute structure of the thecal plates.
The brachia rise from a corresponding number of thecal plates, “radials (RR).”