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


Browse Medical References:

[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M]
[N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]