Acorn shell definitions

Acorn-shell

• (n.) One of the sessile cirripeds; a barnacle of the genus Balanus. See Barnacle.
Found on http://thinkexist.com/dictionary/meaning/acorn-shell/

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Acorn-shell

A'corn-shell` noun (Zoology) One of the sessile cirripeds; a barnacle of the genus Balanus . See Barnacle .
Found on http://www.encyclo.co.uk/webster/A/21

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