Definition of "acorn-shell" []

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

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