The Collaborative International Dictionary of English v.0.48:

Imber-goose \Im"ber-goose`\, n. (Zool.)
   The loon. See Ember-goose.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]