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

Derived forms: oscules

• operagoer
• operand
• operant
• operant conditioning
• operate
• operate on
• operatic
• operatic star
• operatically
• operating
• operating budget
• operating capability
• operating capital
• operating cost
• operating expense
• operating instructions
• operating microscope
• operating procedure
• operating room
• operating statement
• operating surgeon
• operating system
• operating table
• operating theater
• operating theatre