fissure
used in The Hidden Oracle

only 1 use

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Definition

a long, narrow crack; or its creation — especially in the ground or in rock

or:

a crack in the unity of a group; or its creation

Then, up ahead, I heard a massive flushing sound—like water being forced through pipes .... or fissures.
p. 216.8

There are no more uses of "fissure" in The Hidden Oracle.

Typical Usage (best examples)