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Noun: sulfur bottom
Usage: N. Amer (elsewhere: sulphur bottom)
  1. Largest mammal ever known; bluish-grey migratory whalebone whale mostly of Southern Hemisphere
    "The sulfur bottom's enormous fluke disappeared beneath the waves";
    - blue whale, Balaenoptera musculus, sulphur bottom [Brit, Cdn]

Derived forms: sulfur bottoms

Type of: baleen whale, whalebone whale

Part of: Balaenoptera, genus Balaenoptera