Lewis Short
frăcesco, fracŭi, 3
* V. inch. n. [FRACEO; v. fraces and FRACEBUNT], to become soft or mellow, to rot, spoil: olea lecta si nimium diu fuit in acervis, caldore fracescit, et oleum foetidum fit,Varr. R. R. 55, 5 sq.; so, oleum,becomes rancid,Col. 1, 6, 18: (terram cretosam) sinito quatriduum fracescat; ubi bene fracuerit, rutro concidito,to become soft, tractable,Cato, R. R. 128.
Charlton T. Lewis, Charles Short, A Latin Dictionary