What does citral mean?
Citral is a naturally occurring organic compound — specifically a pale yellow liquid aldehyde with the formula C₁₀H₁₆O — best known for its powerful, unmistakable scent of lemon. In chemical terms it is not a single molecule but a mixture of two closely related isomers, geranial and neral, which together produce its characteristic aroma. Citral occurs abundantly in lemongrass oil and in the essential oils of citrus plants, which is how it acquired its name. Because extracting it from lemongrass is efficient and economical, most commercial citral comes from this source rather than from actual lemons. Industry uses it extensively as a fragrance in soaps, detergents, and cosmetics, and as a flavouring agent in foods and drinks where a clean, fresh lemon note is desired. It also serves as a starting material for synthesising vitamin A and related compounds. The word belongs primarily to chemistry and perfumery vocabulary, appearing in technical descriptions of essential-oil composition and product formulation rather than in casual speech.
nounA pale yellow liquid aldehyde (C₁₀H₁₆O) occurring naturally in the oils of lemongrass and citrus fruits, having a strong lemon odour and used widely as a fragrance and flavouring agent. Chemically it is a mixture of the stereoisomers geranial and neral.
- (Chemistry) A pale yellow aldehyde (C₁₀H₁₆O), a mixture of the isomers geranial and neral, present in lemongrass and citrus oils and valued for its intense lemon odour.
- (Industry) The commercial substance extracted chiefly from lemongrass oil, used as a fragrance in soaps, cosmetics, and detergents and as a flavouring in foods and beverages.
"The perfumer relied on citral to give the new soap its crisp, unmistakable note of fresh lemon."
"Lemongrass owes its bright aroma to its exceptionally high citral content."
"Because citral oxidises readily, manufacturers store it away from air and light to preserve its fresh lemon character."
Rarely pluralised; the plural would appear only in contexts distinguishing multiple samples or preparations of the substance, which are uncommon.
"Different batches yielded slightly different citrals depending on their ratio of geranial to neral."
That pure burst of lemon in your dish soap or candy almost never comes from a lemon at all — it comes from citral distilled out of lemongrass.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of citral
Citral was named in the nineteenth century after the citrus plant family whose oils contain it, deriving ultimately from 'citrus', the Latin name for the citron tree. The suffix '-al' reflects its classification among chemists as an aldehyde, following the standard naming conventions that arose as organic chemistry developed in Europe during the 1800s. It thus shares its linguistic root with related terms such as citron, citrine, and citrus itself.
How citral is actually used
Citral is a technical term belonging mainly to chemistry, food science, perfumery, and flavour manufacturing; it rarely appears in everyday conversation. It is uncountable when referring to the bulk substance, though phrases like 'the citral content of the oil' are common in technical writing. It carries neutral connotations and is typically associated with natural, clean, or 'fresh lemon' product qualities.
Easily confused with citral
Citronellal is a different terpene aldehyde found in citronella oil with a rosy-lemon scent, whereas citral is the strongly lemon-scented compound characteristic of lemongrass.
Citric acid is the sour-tasting organic acid of citrus juice, while citral is an aromatic oily liquid responsible for the lemon smell rather than the taste.