The Collaborative International Dictionary of English v.0.48:

Snacot \Snac"ot\, n. [Said to be corrupted fr. NL. syngnathus,
   fr. Gr. sy`n together + gna`qos jaw, because the jaws can be
   only slightly separated.] (Zool.)
   A pipefish of the genus Syngnathus. See Pipefish.
   [1913 Webster]