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

Derived forms: sulphur bottoms

Type of: baleen whale, whalebone whale

Part of: Balaenoptera, genus Balaenoptera