Etymology

seaweed

sea·weed
S1E1A1W4E1E1D2

Today it means: Any of numerous marine algae, such as a kelp. Full definition →

English weed ← Middle English weed ← Old English wēod
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The story

  1. Proto-Indo-European*seykʷ-
  2. Proto-Germanic*sīhwaną
  3. Proto-Germanic*saiwiz
  4. Proto-West Germanic*saiwi
  5. Old Englishsǣ
  6. Middle Englishsee
  7. Englishsea
  8. Proto-West Germanic*weud
  9. Old Englishwēod
  10. Middle Englishweed
  11. Englishweed
  12. English todayseaweed

From sea + weed.

Etymology from Wiktionary, CC BY-SA 4.0.