1. A case or sheath especially a pollen sac or moss capsule
   - sac 
2. Outer sheath of the pupa of certain insects

Derived forms: thecae

Type of: case, cover, covering, natural covering, sheath

Encyclopedia: Theca

• ridiculous
• ridiculously
• ridiculousness
• riding
• riding bitt
• riding boot
• riding breeches
• riding crop
• riding habit
• riding horse
• riding lamp
• riding light
• riding master
• riding mower
• riding school
• ridley
• ridotto
• riel
• Riemann
• Riemannian
• Riemannian geometry
• Riesling
• Riesman
• Rifadin
• rifampin