1. A small metal weapon; worn over the knuckles on the back of the hand
   - brass knucks, knucks, brass knuckles, knuckle duster

1. A joint of a finger when the fist is closed
   - knuckle joint, metacarpophalangeal joint

1. Press or rub with the knuckles 
2. Shoot a marble while keeping one's knuckles on the ground

Derived forms: knuckleses

Type of: arm, articulatio synovialis, diarthrosis, press, shoot, synovial joint, weapon, weapon system

Part of: finger

Encyclopedia: Knuckle

• declaration
• declaration of estimated tax
• Declaration of Independence
• declarative
• declarative mood
• declarative sentence
• declaratory
• declaratory sentence
• declare
• declare oneself
• declared
• declarer
• declass
• declassification
• declassified
• declassify
• declaw
• declension
• declensional
• declinable
• declination
• decline
• decline in quality
• decliner
• declinometer