Usually means: Marine organism, attaches to surfaces.
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We found 10 dictionaries that define the word sea acorn:

General (8 matching dictionaries)
  1. sea acorn: Merriam-Webster
  2. sea-acorn, sea acorn: Wordnik
  3. sea acorn: Wiktionary
  4. Sea acorn: Dictionary.com
  5. Sea acorn: Online Plain Text English Dictionary
  6. Sea acorn: AllWords.com Multi-Lingual Dictionary
  7. sea acorn: FreeDictionary.org
  8. Sea acorn: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Sea acorn: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wiktionary (sea acorn)

▸ noun:  (dated) An acorn barnacle (Balanus).

Similar:
acorn barnacle, acorn-shell, rock barnacle, seacorn, seacalf, sea ear, sea chestnut, sea calf, sea-calf, sea-ear, more...

Opposite:
land acorn, oak, nut, seed

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Similar:
acorn barnacle, acorn-shell, rock barnacle, seacorn, seacalf, sea ear, sea chestnut, sea calf, sea-calf, sea-ear, more...

Opposite:
land acorn, oak, nut, seed



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