Definitions

1. noun

A naturally occurring compound found in essential oils, particularly in the oil of rosemary, which is used as a solvent and in the production of fragrances and perfumes.

“The terpinene in the rosemary oil helped to repel insects from the garden.”

2. noun

A type of monoterpene hydrocarbon, a class of organic compounds found in plant oils.

“The chemical analysis revealed that the plant oil contained high levels of terpinene.”