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

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n. An adult male horse that has not been castrated, especially one kept for breeding.

n. An uncastrated male horse

n. A male kept primarily as a stud

n. A very virile, sexy man

n. A male horse not castrated; a male horse kept for breeding.

n. The male of the horse; an entire horse; a horse kept for breeding purposes.

n. uncastrated adult male horse

"Nevertheless, as Mr. Slocum put it: Twenty-five thousand dollars for a mere work-horse stallion is a madness."

male horse   

mare    filly    colt    gelding    foal   

stud-horse    stud   

stallioneer    stallioner   

horse    entire   

Italian    battalion    gallion    medallion    scallion   

gelding    mare    steed    colt    charger    pony    filly    roan    chestnut    mount