ivory-gull

The Century Dictionary: The Encyelopedic Lexicon of the English Language · 1887 · p. 547

(i’vo-ri-gul), n. A small arctic gull, pure white all over when adult, with rough Ivory-gull (Larus eburners). black feet, technically called Larus eburneus, Pagophila eburnea, or Gavia alba.