We don't have synonyms for ethylenes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ethylene, methylenes and methylene.
(n) :
(organic chemistry) The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C₂H₄.
(n) :
(organic chemistry) The divalent radical derived from ethane.
(n) :
(organic chemistry) The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C₂H₄.
(n) :
(organic chemistry) The divalent radical derived from ethane.