ˌ ̷ ̷ ̷ ̷+ˌfȯ(r)mə̇ˈlāshən noun
( -s )
Etymology: hydr- + formyl + -ation
: the addition of a hydrogen atom and a formyl group to the molecule of a compound containing a double bond by reaction with hydrogen and carbon monoxide, the chief product being one or more aldehydes — compare oxo process