This sense is unusual, but derives from the context, assuming that the word is synonymous with the accompanying three nouns: puter, baude and avuiltre. The editor of Lib Alb translates it as ‘unchaste priests’, which seems unlikely.
s.f.
1pej.femaleprostitute, woman who is ‘for hire’ or ‘available’:
(
MS: 1419
)
La peyne countre putours, bawdes, prestes et avoutours
592
preste1 (1419)