Mere-næddra

According to the Old English Dictionary:

an;

mere-næddra

m. -nædre, an; f. A sea-adder, a lamprey :-- Merenæddra murena vel murina vel lampreda, Wrt. Voc. i. 55, 65. Myre-næddra, 77, 72. Merenædre, ii. 59, 23. mere-næddra