Sistrurus

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Sistrurus

 [sis-troo´rus]
a genus of small rattlesnakes widely distributed throughout the United States, having symmetrical plates covering their heads.

Sistrurus

(sis-troor′ŭs) [L. sistrurus fr Gr. seistrouros, tail shaker]
A genus of small poisonous rattlesnakes that includes the pygmy rattlesnakes (Sistrurus miliarius).