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The Collaborative International Dictionary
Sea adder

Sea adder \Sea" ad"der\ (Zo["o]l.)

  1. The European fifteen-spined stickleback ( Gasterosteus spinachia); -- called also bismore.

  2. The European tanglefish, or pipefish ( Syngnathus acus).

Wiktionary
sea adder

n. 1 The (vern European fifteen-spined stickleback pedia=1) ((taxlink Gasterosteus spinachia species noshow=1), now (taxlink Spinachia spinachia species noshow=1)). 2 The European (vern tanglefish pedia=1), or pipefish ((taxlink Syngnathus acus species noshow=1)).