Dylsta

According to the Old English Dictionary:

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dylsta

pl. dylstan Matter, corruption, mucus; tabum, mucus :-- Fleó ða mettas ða ðe him dylsta on innan wyrcen let him avoid the meats which may work mucus in his inside, L. M. 2, 29; Lchdm. ii. 226, 10. Ðǽr dylstan on synd whereon the mucus is, 1, 31; Lchdm. ii. 72, 20. dylsta