The western of the two towers known as the Teeth of Mordor, that stood on hills either side of the Black Gate of the Morannon, guarding the northwestern entrance into Mordor. Narchost and its companion Carchost were originally built by the Gondorians, as a guard on Mordor after Sauron's first defeat. As Gondor's strength waned, Narchost was abandoned and left to decay, until Sauron returned to his ancient land. His forces took over both the old guard-towers and repaired them, so that at the time of the War of the Ring, they formed part of Sauron's own defences.
This interpretation comes from Tolkien's unpublished index to The Lord of the Rings. The reference to 'bitter-biting' doubtless connects to Narchost's identity as one of the Towers of the Teeth (as did the name of its twin Carchost, 'fang fort'). There may also be a connection to Narch Udûn, an older name for the valley later called simply Udûn that lay behind the Morannon.
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