Word Origin & History
frockmid-14c., from O.Fr. froc "a monk's habit" (12c.), perhaps from Frank. *hroc (cf. O.H.G. hroc "mantle, coat;" O.N. rokkr, O.E. rocc, O.Fris. rokk, Ger. Rock "coat"), from PIE base *rug- "to spin." Another theory traces it to M.L. floccus, from L. floccus "flock of wool." Non-religious use is 1530s.