Biter-nys

According to the Old English Dictionary:

-nyss, e;

biter-nys

f. BITTERNESS; amaritudo :-- Híg cómon to ðære stówe, ðe ys Mara genemned, ðæt ys on úre lýden biternys; ðá ne mihton híg drincan ðæt wæter, forðamðe hit wæs biter: ðá héton híg ealle his naman Mara, ðæt ys on úre lýden biternys venerunt in Mara, nec poterant bibere aquas de Mara, eo quod essent amaræ, unde et congruum loco nomen imposuit vocans ilium Mara, id est amaritudinem, Ex. 15, 23. Heortan biternys bitterness of heart, Homl. Th. ii. 220, 18. Ðæs múþ full is biternysse cujus os plenum est amaritudine, Ps. Spl. second 9, 8. Nolde his onbyrian for ðære biternysse he would not taste it for its bitterness, Homl. Th. ii. 254, 18, 19. biter-nys