The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

negus
    n 1: wine and hot water with sugar and lemon juice and nutmeg