n 1  :  any of an order (Araneae syn. Araneida) of arachnids having a body with two main divisions, four pairs of walking legs, and two or more pairs of abdominal spinnerets for spinning threads of silk used esp. in making webs for catching prey  2  :  SPIDER NEVUS <an arterial >   3  :  an obstruction in the teat of a cow : esp  :  a small irregular horny growth resulting from irritation or bruising .
 
 
 
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