P3R1O1T1O1X8I1D2S1
19 points
PROTOXIDS is validvalid
PROTOXID, an oxide [n]
PROTOXID, that one of a series of oxides having the lowest proportion of oxygen, also PROTOXIDE [n]
PROTOXID, an oxide [n]
PROTOXID, that one of a series of oxides having the lowest proportion of oxygen, also PROTOXIDE [n]