Definition of moor-ill in English:

moor-ill

(also muir-ill, merril, mooral)

noun

Irish English, Scottish, Northern
historical
  • Disease seen in livestock (especially cattle) grazing on moorland, or attributed to this; especially (a) redwater (bovine babesiosis); (b) a (supposed) form of enteritis often accompanied by muscular stiffness and grunting respiration.

Origin

Mid 16th century. From moor + ill.

Pronunciation

moor-ill

/ˈmʊərɪl//ˈmɔːrɪl/