1. Mouth-like opening in a sponge through which water is expelled
   - osculum

Derived forms: oscules

• cryptorchism
• cryptosporidium
• Cryptotermes
• Cryptotermes brevis
• Cryptotis
• Cryptotis parva
• crystal
• crystal ball
• crystal clear
• crystal counter
• crystal detector
• crystal gazing
• crystal lattice
• crystal microphone
• crystal oscillator
• crystal pickup
• crystal rectifier
• crystal set
• crystal tea
• crystal violet
• crystalise
• crystalised
• crystalize
• crystalized
• crystalline