The Collaborative International Dictionary of English v.0.48:
Bernicle \Ber"ni*cle\, n. [OE. bernak, bernacle; cf. OF. bernac;
prob. fr. LL. bernacula for hibernicula, bernicula, fr.
Hibernia; the birds coming from Hibernia or Ireland. Cf. 1st
A bernicle goose. [Written also barnacle.]
Bernicle goose (Zool.), a goose (Branta leucopsis), of
Arctic Europe and America. It was formerly believed that
it hatched from the cirripeds of the sea (Lepas), which
were, therefore, called barnacles, goose barnacles, or
Anatifers. The name is also applied to other related
species. See Anatifa and Cirripedia.