sea adder

noun

A European fifteen-spined stickleback, a fish of species Spinachia spinachia (syn. Gasterosteus spinachia).

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Meanings

nounsea adder (plural sea adders)

plural sea adders · alternative sea-adder

  1. A European fifteen-spined stickleback, a fish of species Spinachia spinachia (syn. Gasterosteus spinachia).
  2. A tanglefish, or greater pipefish (Syngnathus acus).
  3. obsoleteA sea serpent.

Synonyms & antonyms

Also see
sea serpent

Origin

From sea + adder. Compare Old English mere-næddra (“sea-adder, lamprey”).

Full word history & related roots →
Cite this entry
APA

sea adder. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sea%20adder

MLA

“sea adder.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sea%20adder. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “sea adder,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sea%20adder.

Source: sea adder on Wiktionary, CC BY-SA 4.0.