The Collaborative International Dictionary of English v.0.48:

Spiderlike \Spi"der*like`\, a.
   Like a spider. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spiderlike
    adj 1: relating to or resembling a member of the class Arachnida
           [syn: arachnoid, arachnidian, spidery,
           spiderlike, spiderly]