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phytotron
PI
pi (1)
pi (2)
pi bond
pi-dog
pi meson
PIA
pia
pia mater
Piacenza
piacular
piaffe
piani
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piano roll
pi·an·o roll (plural pi·an·o rolls)


noun 
Definition:
 
paper controlling music for piano: a roll of paper with patterns of perforations whose positions determine the sequence of notes played on a player piano
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