The Collaborative International Dictionary of English v.0.48:

Snail-like \Snail"-like`\, a.
   Like or suiting a snail; as, snail-like progress.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snail-like \Snail"-like`\, adv.
   In the manner of a snail; slowly.
   [1913 Webster]