citral

[si-truhl]

cit·ral

[si-truhl]
noun Chemistry.
a pale yellow, water-insoluble, liquid aldehyde, C10H16O, having a strong lemonlike odor, consisting in natural form of two isomers (citral a or geranial and citral b or neral), usually obtained from the oils of lemon and orange or synthetically: used chiefly in perfumery, flavoring, and the synthesis of vitamin A.

Origin:
1890–95; citr(us) + -al1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Citral is always a great word to know.
So is alum. Does it mean:
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals
a double sulfate analogous to potassium alum, as aluminum ammonium sulfate, with the formula R2SO4?X2(SO4)3?24H2O, where R is alkali metal or ammonium
Collins
World English Dictionary
citral (ˈsɪtrəl)
 
n
a yellow volatile liquid with a lemon-like odour, found in oils of lemon grass, orange, and lemon and used in perfumery: a terpene aldehyde consisting of the cis- isomer (citral-a or geranial) and the trans- isomer (citral-b or neral). Formula: (CH3)2C:CH(CH2)2C(CH3):CHCHO
 
[C19: from citr(us) + -al³]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

citral

a pale yellow liquid, with a strong lemon odour, that occurs in the essential oils of plants. It is insoluble in water but soluble in ethanol (ethyl alcohol), diethyl ether, and mineral oil. It is used in perfumes and flavourings and in the manufacture of other chemicals. Chemically, citral is a mixture of two aldehydes that have the same molecular formula but different structures.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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