Sulphur-bottom
Pronunciation : Sul`phur-bot"tom
Part of Speech : n.
Definition : Defn: A very large whalebone whale of the genus Sibbaldius, having a yellowish belly; especially, S. sulfureus of the North Pacific, and S. borealis of the North Atlantic; -- called also sulphur whale.
(Zo?l.)
Source : Webster's Unabridged Dictionary, 1913