Hypertext Webster Gateway: "maintop"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Maintop \Main"top`\, n. (Naut.)
The platform about the head of the mainmast in square-rigged
vessels.
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.