Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. perfrictĭo, ōnis, f. [perfrigesco], a catching cold, a violent cold (post-Aug.), Plin. 20, 14, 55, § 156.
In plur., Plin. 26, 12, 76, § 124 al.; Scrib. Comp. 57, 257.
2. perfrictĭo, ōnis, f. [perfrico], a rubbing, abrasion (post-Aug.), Veg. 1, 35, 1; 1, 38, 3.
Plur.: perfrictionibus cum oleo mederi, Plin. 21, 18, 69, § 116 (but perh. the same word as the preced. in the same meaning).