The Only Use of
keystone
in
Moby Dick
- Zoned by those letters you saw the likeness of three Andes' summits; from one a flame; a tower on another; on the third a crowing cock; while arching over all was a segment of the partitioned zodiac, the signs all marked with their usual cabalistics, and the keystone sun entering the equinoctial point at Libra.†
Chpt 97-99
Definition:
-
(keystone) something of importance upon which other things depend
or:
architecture or masonry: the central building block at the top of an arch or vault (providing pressure to lock the other blocks into place)