Definify.com
Webster 1913 Edition
Olefiant
O-le′fi-ant
,Adj.
(Chem.)
Forming or producing an oil; specifically, designating a colorless gaseous hydrocarbon called ethylene (olefiant gas).
[Archaic]
Webster 1828 Edition
Olefiant
OLEF'IANT
,Adj.
Olefiant gas, is so called from its property of forming with chlorin a compound resembling oil.