Serbonian
Pronunciation : Ser*bo"ni*an
Part of Speech : a.
Definition : Defn: Relating to the lake of Serbonis in Egypt, which by reason of the sand blowing into it had a deceptive appearance of being solid land, but was a bog. A gulf profound as that Serbonian bog . . . Where armies whole have sunk. Milton.
Source : Webster's Unabridged Dictionary, 1913