P3R1O1T1O1X8I1D2
18 points
PROTOXID is validvalid
an oxide [n PROTOXIDS]
that one of a series of oxides having the lowest proportion of oxygen, also PROTOXIDE [n -S]
an oxide [n PROTOXIDS]
that one of a series of oxides having the lowest proportion of oxygen, also PROTOXIDE [n -S]