παρά-τριψις,εως,ἡ,
A. rubbing against one another, friction, νεφῶν
Epicur. Ep. 2p.45U.
(pl.), cf. Arist. Mu. 395b5 , Thphr. Lap. 45 , Ph. Bel. 78.10 , D.S. 3.36 , Placit. 3.3.11 (pl.), M.Ant. 6.13 ;τῇ τοῦ ποδὸς πρὸς τὴν γῆν π. Chrysipp. ap. S.E. P. 1.70 .