Noun: theca (thecae) thee-ku
- A case or sheath especially a pollen sac or moss capsule
"The anther's theca burst open to release pollen";
- sac
- Outer sheath of the pupa of certain insects
"The butterfly emerged from its theca, leaving the empty case behind"
Derived forms: thecae
Type of: case, cover, covering, natural covering, sheath
Encyclopedia: Theca