Trisulc \Tri”sulc\ (tr[imac]”s[u^]lk), n. [L. trisulcus; tri-
(see Tri-) + sulcus a furrow.]
Something having three forks or prongs, as a trident. [Obs.]
“Jupiter’s trisulc.” –Sir T. Browne.
[1913 Webster]

Source: Free Dictionary.

a flame rushed up the night, lighting the whole sky with a livid glare. And in that trisulk flash Corinius beheld though the south-west window the Iron Tower blasted and cleft asunder, and the next instant fallen in an avalanche of red-hot ruin.

Source: The Worm Ouroboros by E R Eddison.

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