Definition of grass sickness in English:

grass sickness

Line breaks: grass sick|ness

Entry from British & World English dictionary

noun

[mass noun]
A disease of horses which affects the workings of the bowel and is usually fatal.

Definition of grass sickness in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict