nine-membered
Definition
- Adjective:
- Having a ring structure composed of nine atoms: Used specifically in chemistry to describe a cyclic compound whose ring consists of nine atoms (members).
Usage
- This term is a technical adjective used almost exclusively in chemistry. It classifies the size of a ring structure within a molecule. The "members" are the atoms (e.g., carbon, oxygen, nitrogen) that form the closed ring.
Examples
- Adjective:
- The chemist synthesized a novel nine-membered lactone.
- This class of antibiotics often contains a nine-membered ring system.
Advanced Usage
- The term is part of a systematic naming convention for ring sizes in organic chemistry (e.g., three-membered, five-membered, nine-membered).
- It specifies the ring size but not the types of atoms or the presence of double bonds. Further nomenclature is needed for a complete description (e.g., a nine-membered heterocycle).
Variants and Related Words
- Ring: (n) The cyclic structure itself.
- Cyclic compound: (n) A general term for any molecule containing one or more rings of atoms.
- Member: (n) In this context, refers to an atom within the ring.
Synonyms
- Nonatomic (in specific systematic nomenclature, but "nine-membered" is the standard descriptive term).
Related Phrases / Compound Terms
- Nine-membered ring: (n) The specific ring structure itself. This is the noun phrase from which the adjective "nine-membered" is derived.
- The stability of a nine-membered ring can be influenced by ring strain.
Adjective
-
of a chemical compound having a ring with nine members
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