heloderma(redirected from Helodermatidae)
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The only genus of poisonous lizards, such as the Gila monster, so named because of the tubercular scales that cover their bodies. They are native to Mexico and the southwestern U.S.
[G. hēlos, nail, + derma, skin]
Fibromas that form on the extensor surfaces of the proximal interphalangeal joints of the hands.