The Collaborative International Dictionary of English v.0.48:

Blindworm \Blind"worm`\, n. (Zool.)
   A small, burrowing, snakelike, limbless lizard (Anguis
   fragilis), with minute eyes, popularly believed to be blind;
   the slowworm; -- formerly a name for the adder.
   [1913 Webster]

         Newts and blindworms do no wrong.        --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Anguis fragilis
    n 1: small burrowing legless European lizard with tiny eyes;
         popularly believed to be blind [syn: blindworm,
         slowworm, Anguis fragilis]