trioxide

English Thesaurus

1. an oxide containing three atoms of oxygen in the molecule (noun.substance)

hypernym	:	oxide,
definition	:	any compound of oxygen with another element or a radical (noun.substance)

hyponym	:	arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic,
definition	:	a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer (noun.substance)