1. Pertaining to or worked or produced by friction
   "frictional electricity"; "frictional heat"; "frictional gearing"

See also: friction

• pick over
• pick up the gauntlet
• pick up the tab
• Pick's disease
• wave-off
• wave-particle duality
• waveband
• waveform
• wavefront
• wavefunction
• waveguide
• wavelength
• wavelet
• wavelike
• Wavell
• waver
• waverer
• wavering
• waveringly
• waviness
• waving
• wavy
• wavy-grained
• wavy-leaved aster
• waw