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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| the offspring of a zebra and a donkey. |
citronella oil
member of a class of naturally occurring organic substances called terpenes. Citronella oil is obtained from the leaves of the oil grasses Cymbopogon nardus and C. winterianus. The oil has a wide range of uses, from medicines to perfumes for soaps. Two derivatives of citronella oil include the alcohol citronellol and the aldehyde citronellal.
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