The word, unique to this passage, remains a mystery. Formally, it may perhaps be compared to palevole and pincevole, which have the same (unexplained) ending. As the editor of this text suggests, it may be that magpies were used in training falcons for hunting.
s.
1orn.zool.magpie, bird with black and white plumage and a long pointed tail, Pica pica (?):
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1302-05
)
[...] et vous mandoms que le dit faucon que n’est mie uncore affeitez facez treiner a heron, a siege et a pievol et a volant, et en totes les maneres par quou vous le porrez bien entrer et faire baud
13
pievol (1302-05)