What is "ember-goose"

Ember-goose \Em"ber-goose`\, n. [Cf. Norw. embergaas, hav-imber, hav-immer, Icel. himbrin, himbrimi.] (Zo["o]l.) The loon or great northern diver. See Loon. [Written also emmer-goose and imber-goose.]

also embergoose, "loon," 1744, from Norwegian emmer-gaas, perhaps so called from its appearing on the coast in the ember days before Christmas.

n. The great northern loon, ''Gavia immer''.