phellandrene

noun

phel·lan·drene

-ˌdrēn

plural -s

: either of two isomeric aromatic oily liquid terpene hydrocarbons C₁₀H₁₆ occurring in many essential oils:

: the terpene C₃H₇C₆H₆CH₃ occurring in the dextrorotatory form especially in bitter fennel oil and ginger-grass oil and in the levorotatory form especially in eucalyptus oils (as from Eucalyptus phellandra); 1,5-para-menthadiene

called also alpha-phellandrene

: the terpene C₃H₇C₆H₇=CH₂ occurring in the dextrorotatory form especially in water-fennel oil and in the levorotatory form especially in turpentine; 1(7),2-para-menthadiene

called also beta-phellandrene