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keystone
used in Moby Dick

only 1 use
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Definition
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)
  • 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.
    Chapters 97-99 -- The Lamp; Stowing Down & Clearing Up; Doubloon (51% in)

There are no more uses of "keystone" in Moby Dick.

Typical Usage  (best examples)
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