Source : Webster's Revised Unabridged Dictionary (1913)

Negus \Ne"gus\, n.
   A beverage made of wine, water, sugar, nutmeg, and lemon
   juice; -- so called, it is said, from its first maker,
   Colonel Negus.

Source : WordNet®

negus
     n : wine and hot water with sugar and lemon juice and nutmeg