Lewis Short
dē-rĭgesco, gŭi, 3
* V. inch. n. (occurring only in the perf.), to become stiff or rigid; to curdle (a poet. word): formidine sanguis deriguit,Verg. A. 3, 260: deriguere oculi,were fixed,id. ib. 7, 447; so, oculi,Ov. M. 14, 754: hirsutae comae,id. F. 3, 332: manus,Luc. 3, 613: cervix,Ov. M. 5, 233: Niobe malis,id. ib. 6, 303 (al. diriguit).
Charlton T. Lewis, Charles Short, A Latin Dictionary