T1R1I1O1X8I1D2
15 points
TRIOXID is validvalid
trioxide [n TRIOXIDS]
an oxide containing three atoms of oxygen; as, sulphur trioxide, also TRIOXIDE [n -S]
trioxide [n TRIOXIDS]
an oxide containing three atoms of oxygen; as, sulphur trioxide, also TRIOXIDE [n -S]