haemagglutinate
C2Technical/Scientific
Definition
Meaning
To cause red blood cells to clump together.
The specific biological process where agglutinins (antibodies or other substances) bind to antigens on the surface of red blood cells, causing them to aggregate. This is a key reaction in blood typing, virology (e.g., influenza virus binding), and some immunological assays.
Linguistics
Semantic Notes
Primarily a transitive verb in laboratory contexts. The process is deliberate and observable, often used to indicate a test result or a viral property.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'haemagglutinate' (UK) vs. 'hemagglutinate' (US). The UK spelling retains the 'ae' diphthong derived from Greek, while the US spelling simplifies to 'e'.
Connotations
Identical in technical meaning and application.
Frequency
Equally rare in general discourse, but standard within hematology, immunology, and virology in their respective spelling regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject: virus/antibody] haemagglutinates [Object: red blood cells/erythrocytes].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “N/A”
Usage
Context Usage
Business
N/A
Academic
Used in research papers and textbooks in microbiology, immunology, and hematology.
Everyday
Virtually never used.
Technical
Core term in laboratory protocols for blood typing (e.g., 'The serum sample was observed to haemagglutinate type A cells.') and virology (e.g., 'Influenza viruses haemagglutinate avian erythrocytes.').
Examples
By Part of Speech
verb
British English
- The novel avian virus was found to haemagglutinate human erythrocytes effectively.
- Not all lectins will haemagglutinate every blood type.
American English
- The lab protocol requires you to hemagglutinate the sample at room temperature.
- If the antibody does not hemagglutinate the red cells, the test is negative.
adverb
British English
- N/A - Not standardly used.
American English
- N/A - Not standardly used.
adjective
British English
- The haemagglutinating activity of the influenza strain was unusually high.
- We observed a strong haemagglutinated mass under the microscope.
American English
- The hemagglutinating property is a key virulence factor.
- A hemagglutinated pellet forms at the bottom of the well.
Examples
By CEFR Level
- N/A
- N/A
- Scientists can use the ability of a virus to haemagglutinate as a simple identification test.
- The lecture explained how some proteins haemagglutinate blood.
- The researcher's primary aim was to determine which viral strains retained the capacity to haemagglutinate after genetic modification.
- The assay confirmed that the monoclonal antibody could haemagglutinate type O Rh-positive erythrocytes but not Rh-negative ones.
Learning
Memory Aids
Mnemonic
Think: 'HAEM' (blood) + 'AGGLUTINATE' (glue together) = to glue blood cells together.
Conceptual Metaphor
A VELCRO-LIKE BINDING: The virus or antibody acts like one side of Velcro, sticking to multiple blood cells and pulling them into a cluster.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with 'свёртывать' (coagulate/clot). Haemagglutination is about surface binding and clumping, not the coagulation cascade. The more precise term is 'гемагглютинировать' or 'вызывать агглютинацию эритроцитов'.
Common Mistakes
- Using it intransitively without an object (e.g., 'The blood haemagglutinated' is less precise than 'The virus haemagglutinated the blood').
- Confusing 'haemagglutinate' (verb for the process) with 'haemagglutinin' (noun for the substance causing it).
Practice
Quiz
What is the primary meaning of 'haemagglutinate'?
FAQ
Frequently Asked Questions
No. Coagulation refers to the complex process of blood clotting, involving platelets and a cascade of proteins (like fibrin) to form a solid gel. Haemagglutination is the simpler, reversible clumping of intact red blood cells due to surface binding by specific agents like antibodies or viral proteins.
Almost exclusively in technical settings: university-level biology courses, medical and virology research papers, immunology and hematology laboratory manuals, and protocols for blood bank testing.
The main noun forms are 'haemagglutination' (the process) and 'haemagglutinin' (the specific substance, like a viral protein or antibody, that causes the clumping).
It is fundamental for determining ABO blood groups (ensuring safe transfusions) and for diagnosing certain viral infections (like influenza) through tests that detect or inhibit the haemagglutination reaction.