Frio, frias, friâre. Plin. To crumme or breake small.
Lewis and Short: Latin dictionary
frĭo, āvi, ātum, 1, v. a., to rub, break or crumble into small pieces: terra, quae facile frietur, Varr. R. R. 1, 9, 7: glaebis terrarum saepe friatis, Lucr. 1, 888: ut inter se tritum tarde frietur, Plin. 12, 19, 42, 92; 34, 12, 29, 117: ut gemma in micas frietur, id. 12, 14, 32, 65: friatum amomum, id. 12, 13, 28, 49.