acorn-shell definition

  • noun:
    • One of the sessile cirripeds; a barnacle of the genus Balanus.
    • among sessile cirripeds; a barnacle of this genus Balanus. See barnacle.
    • The shell of acorn.
    • among the cirripeds of this genus Balanus; a barnacle: called by this name from a supposed resemblance of a number of the types to acorns. See Balanus and Cirripedia.

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