noun
also di·olefine (ˈ)dī+
( -s )
Etymology: International Scientific Vocabulary di- + olefin
: any of a series of aliphatic hydrocarbons C n H 2n-2 (as allene, butadiene, isoprene) containing two double bonds — called also alkadiene, diene
• di·olefinic (|)dī+ adjective