from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) One of the sessile cirripeds; a barnacle of the genus Balanus. See barnacle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun zoology One of the sessile cirripeds; a barnacle of the genus Balanus.


Sorry, no etymologies found.


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  • In an acorn-shell, if the training data spans the REAL range of data in the periods of interest, it should be as good at capturing internal multivariate projective variation as anything.

    Willis E on Hansen and Model Reliability « Climate Audit 2006

  • Down came spiralling a few bits of bark and acorn-shell, quite in the old familiar way.

    Darkness and Dawn George Allan England 1906

  • But not less important is the fact that the open waters afford a safe cradle or nursery for many a delicate larva, e.g. of crab and starfish, acorn-shell and sea-urchin, which could not survive for a day in the rough-and-tumble conditions of the shore and the shallow water.

    The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told J. Arthur Thomson 1897


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