benz(o)-
Benzene.
[The first part of English benzoic plus -o-, from gum benzoin, based on Arabic lubānjāwī, incense of Java.]
This indicates compounds that contain a six-membered ring of carbon atoms, a derivative of benzene. Examples include benzaldehyde, a colourless liquid aldehyde smelling of bitter almonds, used to make dyes and perfumes; benzodiazepine, a member of a group of tranquillizers, such as Librium or Valium; benzopyrene, the major carcinogen present in cigarette smoke; and benzoquinone, a yellow crystalline compound.
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