Lewis & Short

perstrictĭo, ōnis, f. [perstringo],

  1. I. a rubbing, friction (post-class.), Veg. Vet. 1, 35; so id. ib. 1, 38.
  2. II. Trop., a verbal attack: de perstrictione diversae partis nihil cavetur, Paul. Sent. 5, 4, 15.