Definition of citrene in US English:

citrene

noun

Chemistry
rare
  • A monocyclic hydrocarbon of the terpene series which is the d-isomer of limonene (hence more usually called d-limonene) and is an orange-scented liquid present in the essential oils of lemon, orange, bergamot, neroli, etc. Also (now historical): any member of the class of monocyclic terpenes.

Origin

Mid 19th century. From citro- + -ene, after French citrène.

Pronunciation

citrene

/ˈsɪtriːn/