Search Result for "trioxide": 
Wordnet 3.0

NOUN (1)

1. an oxide containing three atoms of oxygen in the molecule; 



The Collaborative International Dictionary of English v.0.48:

Trioxide \Tri*ox"ide\, n. [Pref. tri- + oxide.] (Chem.)
   An oxide containing three atoms of oxygen; as, sulphur
   trioxide, SO3; -- formerly called tritoxide.
   [1913 Webster]


WordNet (r) 3.0 (2006):

trioxide
    n 1: an oxide containing three atoms of oxygen in the molecule