spider

spider (spI´der)

1. An arthropod of the order Araneida (subclass Arachnida) characterized by four pairs of legs, a cephalothorax, a globose smooth abdomen, and a complex of web-spinning spinnerets. Among the venomous s.'s found in the New World are the black widow s., Latrodectus mactans; red-legged widow s., Latrodectus bishopi; pruning s., or Peruvian tarantula, Glyptocranium gasteracanthoides; Chilean brown s., Loxosceles laeta; Peruvian brown s., Loxosceles rufiper; brown recluse s. of North America, Loxosceles reclusus. 2. spider angioma 3. An obstructive growth in the teat of a cow. [O. E. spinnan, to spin]
arterial s.spider angioma
vascular s.spider angioma

 

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