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The Collaborative International Dictionary
Rancescent

Rancescent \Ran*ces"cent\ (r[a^]n*s[e^]s"sent), a. [L. rancescens, p. pr. of rancescere, v. incho. from rancere to be rancid.] Becoming rancid or sour.

Wiktionary
rancescent

a. Becoming rancid or sour.