The Collaborative International Dictionary
Sulphur-bottom
Sulphur-bottom \Sul`phur-bot"tom\, n. (Zo["o]l.) 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.
Wiktionary
sulphur-bottom
n. (alternative spelling of sulfur-bottom English)
Usage examples of "sulphur-bottom".
Now you take the sulphur-bottom whale," Vexley hastily launched off again.