We don't have synonyms for selenic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are splenic, serenic and silenic.
(adj) :
(inorganic chemistry) Of, pertaining to or containing selenium, especially in a higher oxidation state than the corresponding selenious compound.
(adj) :
(inorganic chemistry) Of, pertaining to or containing selenium, especially in a higher oxidation state than the corresponding selenious compound.