This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of ruminant.

"_Some ruminants are not hollow-horned_ must be a negative proposition, having 'hollow-horned' for its subject, either in E. or O.; but these would be respectively the contrary and contradictory of _All hollow-horned animals are ruminants_; and, therefore, if this be true, they must both be false."

ruminant    herbivora    hippopotami    grazers    carnivora