Fersc

According to the Old English Dictionary:

FERSC

adj. FRESH, pure, sweet; dulcis :-- Eufrates is mǽst eallra ferscra wætera, and is yrnende þurh middewearde Babilónian burh Euphrates is the greatest of all fresh waters [rivers], and runs through the middle of the city of Babylon, Ors. 2, 4; Bos. 44, l0. Gyf se wǽta sealt byþ of ðære sǽ, hit byþ þurh ðære sunnan hǽtan to ferscum wæterum awend if the moisture be salt from the sea, it is turned to fresh water through the heat of the sun, Bd. de nat. rerum; Lchdm. iii. 278, 9-12; Wrt. popl. science 19, 3. [Chauc. freisshe: Laym. freche: Plat. frisk: Frs. fersck: O. Frs. fersk, fersch, farsch: Dut. versch: Ger. frisch: M. H. Ger. vrisch: O. H. Ger. frisc: Dan. frisk, fersk: Swed. frisk, färsk: Icel. frískr: Wel. ffres.] fersc