noun
unsaturated hydrocarbon
Technical term in organic chemistry for a hydrocarbon containing at least one double or triple bond.
エチレンは最も単純な不飽和炭化水素の一つです。
Ethylene is one of the simplest unsaturated hydrocarbons.
Compound of 不飽和 (unsaturated) + 炭化水素 (hydrocarbon). The term is a direct calque from English 'unsaturated hydrocarbon'.