The Collaborative International Dictionary of English v.0.48:

Newt \Newt\, n. [OE. ewt, evete, AS. efete, with n prefixed, an
   ewt being understood as a newt. Cf. Eft.] (Zool.)
   Any one of several species of small aquatic salamanders. The
   common British species are the crested newt (Triton
   cristatus) and the smooth newt (Lophinus punctatus). In
   America, Diemictylus viridescens is one of the most
   abundant species.
   [1913 Webster]

WordNet (r) 3.0 (2006):

newt
    n 1: small usually bright-colored semiaquatic salamanders of
         North America and Europe and northern Asia [syn: newt,
         triton]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

NEWT
       NeWS Terminal, "NeWT"