We don't have synonyms for solion yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are solon, scolion and soliton.
(n) :
(electronics, historical) An electrochemical device of the 1950s, intended to replace the transistor in certain situations, and using ions rather than electrons to carry electrical charge.
(n) :
(electronics, historical) An electrochemical device of the 1950s, intended to replace the transistor in certain situations, and using ions rather than electrons to carry electrical charge.