D defs.my
Entry 1 sense Webster, 1913

Selenio-

· Se·le·ni·o- · IPA
01 A combining form (also used adjectively) denoting the presence of selenium or its compounds; as, selenio-phosphate, a phosphate having sele…
  1. 1.
    A combining form (also used adjectively) denoting the presence of selenium or its compounds; as, selenio-phosphate, a phosphate having selenium in place of all, or a part, of the oxygen.(Chem.)