The Collaborative International Dictionary of English v.0.48:

Krait \Krait\, n. [Native name.] (Zool.)
   A very venomous snake of India (Bungarus coeruleus), allied
   to the cobra. Its upper parts are bluish or brownish black,
   often with narrow white streaks; the belly is whitish.
   [1913 Webster]

WordNet (r) 3.0 (2006):

krait
    n 1: brightly colored venomous but nonaggressive snake of
         southeastern Asia and Malay peninsula