The Collaborative International Dictionary
Therf
Therf \Therf\, a. [AS. ?eorf; akin to OHG. derb, Icel. ?jarfr.] Not fermented; unleavened; -- said of bread, loaves, etc.
Pask and the feast of therf loaves.
--Wyclif.
Wiktionary
therf
a. (context obsolete of bread, loaves, etc. English) Not fermented, unleavened.