Century Dictionary and Cyclopedia - n. The shell of the acorn. -
n. 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. GNU Webster's 1913 - n.
(Zoöl.) One of the sessile cirripeds; a barnacle of the genus
Balanus. See barnacle. “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.” ‘acorn-shell’ hasn't been added to any lists yet.
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