In a manner relating to or involving ethylene groups or carbon-carbon double bonds, typically used in describing chemical behavior or reactions.
From ethylenic + -ally (adverb-forming suffix); forms an adverb describing ethylene-related processes.
Describing how molecules react 'ethylenically' is a shorthand chemists use—it signals that a C=C double bond is the key to understanding what's about to happen in that reaction.
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