from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of the sessile cirripeds; a barnacle of the genus Balanus.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the sessile cirripeds; a barnacle of the genus Balanus. See barnacle.
from The 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.
Sorry, no etymologies found.
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.