isologue
Very Low (Technical/Specialist)Formal, Technical, Scientific
Definition
Meaning
A chemical compound that is structurally similar to another, differing only by the replacement of an atom or group with another of similar valency or properties.
In a broader scientific context, any entity (e.g., a molecule, gene, or structure) that is analogous to another in form or function, often within a homologous series.
Linguistics
Semantic Notes
Primarily used in chemistry and biochemistry. The term denotes a specific type of structural analogy, not just general similarity. It implies a systematic, predictable variation within a series of related compounds.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is identical.
Connotations
None beyond its technical definition.
Frequency
Equally rare and specialised in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
X is an isologue of YThe isologues of benzeneTo form isologues withVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Used in specialised chemistry and biochemistry papers to describe compound relationships.
Everyday
Never used.
Technical
Core term in specific sub-fields of chemistry for precise classification of molecular structures.
Examples
By Part of Speech
adjective
British English
- The isologue series showed predictable changes in boiling point.
- They studied the isologue relationships within the new polymer family.
American English
- The isologue compounds were tested for reactivity.
- An isologue replacement was made in the synthetic pathway.
Examples
By CEFR Level
- Researchers identified a new isologue in the laboratory.
- The properties of an isologue can often be predicted from its relatives.
- The team synthesised the sulphur isologue of the original oxygen-based compound to study its metabolic pathway.
- By examining a complete series of isologues, they were able to deduce the key structural determinant for receptor binding.
Learning
Memory Aids
Mnemonic
Think 'ISO' (same) + 'LOGUE' (as in analogue, meaning a similar thing). An isologue is the 'same kind of talk' or story in chemical structure.
Conceptual Metaphor
CHEMICAL COMPOUNDS ARE WORDS IN A LANGUAGE (where isologues are synonyms or words with the same grammatical structure).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'изолог' (a term from mathematics/geometry referring to a line of equal values). The chemical term is highly specific.
- Avoid direct translation as 'изолог' in a chemical context without verifying the intended mathematical vs. chemical meaning.
Common Mistakes
- Using 'isologue' to mean any similar thing outside of precise chemical/structural series.
- Confusing it with 'isotope' (same element, different neutrons) or 'isomer' (same formula, different arrangement).
Practice
Quiz
In which field is the term 'isologue' primarily used?
FAQ
Frequently Asked Questions
No, it is a highly specialised technical term used almost exclusively in chemistry and related sciences.
An isomer has the same molecular formula but a different arrangement of atoms. An isologue has a similar structure but with a specific atom or group replaced by another of similar valency (e.g., oxygen replaced by sulphur).
No, standard usage is only as a noun or adjective (e.g., 'isologue compound').
No, it is only relevant for learners specializing in advanced chemistry or biochemistry.