1. Having but one principal or specialized surface
   "a primitive unifacial flint tool"

See also: unidirectional

• piano action
• piano damper
• piano keyboard
• piano lesson
• piano maker
• piano music
• piano player
• piano sonata
• piano stool
• piano teacher
• piano tuner
• piano wire
• pianoforte
• Pianola
• piassava
• piassava palm
• piaster
• piastre
• piazza
• PiB
• pibgorn
• Pibit
• pibroch
• pic
• pica