Hypertext Webster Gateway: "bluestone"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bluestone \Blue"stone`\, n.
1. Blue vitriol. --Dunglison.
2. A grayish blue building stone, as that commonly used in
the eastern United States.
From WordNet (r) 1.7 (wn)
bluestone
n : bluish-gray sandstone used for paving and building
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.