hydroxy
Definition
- Adjective:
- Being or containing a hydroxyl group: In chemistry, "hydroxy" describes a molecule or radical that contains one or more hydroxyl groups (-OH), which consist of an oxygen atom bonded to a hydrogen atom.
Usage
- The term "hydroxy" is used almost exclusively as a combining form or prefix in chemical nomenclature. It is not typically used as a standalone word in general language but as part of a larger compound name to indicate the presence of a hydroxyl functional group.
- It modifies the name of a compound to specify its chemical structure.
Examples
- Adjective (as a combining form):
- The molecule is a hydroxy acid, meaning it contains both a carboxylic acid group and a hydroxyl group.
- Ethanol has a hydroxy group attached to a carbon chain.
Advanced Usage
- In IUPAC Nomenclature: In systematic chemical naming, "hydroxy-" is used as a prefix to denote a substituent -OH group on a parent structure.
- The compound 2-hydroxypropanoic acid is more commonly known as lactic acid.
- In Biochemistry: Frequently appears in the names of biologically important molecules like steroids, vitamins, and acids.
- 25-hydroxyvitamin D is a crucial metabolite for calcium absorption.
Variants and Related Words
- Hydroxyl (noun): Refers specifically to the functional group (-OH) itself.
- The hydroxyl group is highly polar.
- Hydroxide (noun): A chemical compound containing the OH⁻ ion (e.g., sodium hydroxide, NaOH).
- Dihydroxy-: A prefix indicating the presence of two hydroxyl groups.
- Polyhydroxy-: A prefix indicating the presence of many hydroxyl groups.
Synonyms
- -ol (suffix): In organic chemistry, the suffix "-ol" often indicates an alcohol, which contains a hydroxyl group (e.g., methanol, ethanol). While not a direct synonym, it serves a similar descriptive function for a major class of hydroxy compounds.
Notes on Meaning
- The word "hydroxy" has a single, precise meaning in scientific contexts related to chemistry and biochemistry. It does not have idiomatic or figurative uses.
Adjective
-
being or containing a hydroxyl group
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