worm-shaped

from WordNet (r) 3.0 (2006)

worm-shaped
    adj 1: resembling a worm; long and thin and cylindrical [syn:
           {vermiform}, {worm-shaped}]

from The Collaborative International Dictionary of English v.0.48

Worm-shaped \Worm"-shaped`\, a.
   Shaped like a worm; ?hick and almost cylindrical, but
   variously curved or bent; as, a worm-shaped root.
   [1913 Webster]