Nǽder-cynn

According to the Old English Dictionary:

es:

nǽder-cynn

n. A kind of snake:-- Cwóman hornede nǽdran, carastis ꝥ nǽdercyn, Nar. 13, 16. Saga mé hwæt nǽddercynna sí on eorðan. Ic ðé secge, feówer and þrittig. Sal. K. 204, 7. Wið scorpiones stingc and wið ealra nǽddercynna slitas, Lch. i. 304, 18. næder-cynn