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rattler (n.)

mid-15c., "one who talks overmuch, without reflection or consideration;" agent noun from rattle (v.). From c. 1300 as a surname. As short for rattlesnake, 1827.

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Definitions of rattler from WordNet

rattler (n.)
pit viper with horny segments at the end of the tail that rattle when shaken;
Synonyms: rattlesnake
rattler (n.)
a railroad train consisting of freight cars;
Synonyms: freight train
From wordnet.princeton.edu