from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small open-top shelter, originally a cask, on the top of the foremast, large enough to accommodate a lookout. It was used by whalers to watch for a blow (spout), or in icebound waters to seek a channel.
Sorry, no etymologies found.
There, at the crow's nest – like heart's blood, splashed against Lisbon's sky – the scarlet flag of the Captain-Major!