Source : Webster's Revised Unabridged Dictionary (1913)

Sea adder \Sea" ad"der\ (Zo["o]l.)
   (a) The European fifteen-spined stickleback ({Gasterosteus
       spinachia}); -- called also {bismore}.
   (b) The European tanglefish, or pipefish ({Syngnathus acus}).

Bismer \Bis"mer\, n.
   1. A rule steelyard. [Scot.]

   2. (Zo["o]l.) The fifteen-spined ({Gasterosteus spinachia}).