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From The Collaborative International Dictionary of English v.0.48:
Whirlbat \Whirl"bat`\, n. Anything moved with a whirl, as preparatory for a blow, or to augment the force of it; -- applied by poets to the cestus of ancient boxers. [1913 Webster] The whirlbat and the rapid race shall be Reserved for Caesar. --Dryden. [1913 Webster]