One of the mysteries of the English language finally explained.
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.
Mid 19th century. From citro- + -ene, after French citrène.
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