lactose
/'læktous/
Definition
- Noun:
- A type of sugar found in milk: Lactose is a disaccharide sugar composed of one molecule of glucose and one molecule of galactose. It is naturally present in the milk of mammals.
- A nutritional component: It serves as a primary source of energy for infants and young mammals.
Examples of Usage
- Noun:
- Lactose is broken down in the small intestine by the enzyme lactase.
- Some people have difficulty digesting lactose, a condition known as lactose intolerance.
- Yogurt contains less lactose than milk due to the fermentation process.
Advanced Usage
- "Lactose-free": A term used to describe products from which lactose has been removed or broken down.
- She buys lactose-free milk because she is intolerant.
- Technical/Biochemical Context: Refers to the specific chemical compound C₁₂H₂₂O₁₁.
- The hydrolysis of lactose yields glucose and galactose.
Variants and Related Words
- Lactase (noun): The enzyme required to digest lactose.
- Lactase deficiency is the cause of lactose intolerance.
- Lactic (adjective): Relating to or derived from milk.
- Lactic acid is produced when lactose is fermented.
Synonyms
- Milk sugar: A common synonym for lactose, emphasizing its source.
Related Phrases and Compounds
- Lactose intolerance (noun phrase): The inability to digest lactose properly.
- Symptoms of lactose intolerance include bloating and diarrhea.
- Lactose malabsorption (noun phrase): The impaired absorption of lactose in the intestine.
Noun
- a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk
- cow's milk contains about 4.7% lactose
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