dyad /dīˈad/

1. A pair of units treated as one
2. A bivalent atom, radical, or element (chem)

• knee-jerk
• knee-jerks
• knee joint
• knee joints
• kneel
• kneeled
• knee-length
• kneeler
• kneelers
• kneeling
• kneels
• knee-pad
• knee-pads
• knee-pan
• knee-pans
• knees
• knee sock
• knee socks
• knee-stop
• knee-stops
• knees-up
• knees-ups
• knee-swell
• knee-timber
• knee-timbers