1. Expression of pain
   - ouch

Encyclopedia: Ow Ow, My Balls Hurt

• Catherine
• Catherine de Médicis
• Catherine Howard
• Catherine I
• Catherine II
• Catherine of Aragon
• Catherine Parr
• Catherine the Great
• catherine wheel
• catheter
• catheterisation
• catheterise
• catheterization
• catheterize
• cathexis
• cathode
• cathode ray
• cathode-ray oscilloscope
• cathode-ray tube
• cathodic
• catholic
• Catholic Church
• Catholic Pope
• Catholic Reaction Force
• Catholic school