coccus
C2Technical/Scientific
Definition
Meaning
Any spherical or roughly spherical bacterium.
The term can also refer to certain types of spherical or rounded cells found in plants (e.g., berries of certain plants) or other organisms, but the primary biological use pertains to spherical bacteria.
Linguistics
Semantic Notes
A singular bacterium is a coccus; the plural is cocci. It's a basic morphological classification of bacteria, contrasting with 'bacillus' (rod-shaped) and 'spirillum' (spiral-shaped).
Dialectal Variation
British vs American Usage
Differences
Spelling and pronunciation are consistent between UK and US English for this scientific term.
Connotations
None; it is a neutral, technical term in both regions.
Frequency
Used with identical frequency and meaning in biological/medical contexts in both UK and US English.
Vocabulary
Collocations
Grammar
Valency Patterns
[adjective] + coccuscoccus + of + [genus/species]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “No idioms exist for this technical term.”
Usage
Context Usage
Business
Not used.
Academic
Primary usage; common in microbiology, medicine, and biological science textbooks and research papers.
Everyday
Rarely used outside scientific contexts.
Technical
Core term; essential for describing bacterial morphology.
Examples
By Part of Speech
verb
British English
- No verb form exists.
American English
- No verb form exists.
adverb
British English
- No adverb form exists.
American English
- No adverb form exists.
adjective
British English
- No standard adjective form. 'Coccal' is used technically (e.g., coccal infection).
American English
- No standard adjective form. 'Coccal' is used technically (e.g., coccal infection).
Examples
By CEFR Level
- Not applicable for this C2-level word.
- Under the microscope, some bacteria look like little balls; these are called cocci.
- The lab report identified the pathogen as a gram-positive coccus, requiring specific antibiotics.
- Streptococcus pneumoniae, a lancet-shaped diplococcus, is a major cause of community-acquired pneumonia.
Learning
Memory Aids
Mnemonic
Think of 'coccus' sounding like 'cocoa' beans, which are roughly spherical, to remember it describes a round-shaped bacterium.
Conceptual Metaphor
Often conceptualized as a 'BALL' or 'BEAD' (e.g., 'a chain of beads' for streptococci).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation from Russian 'кокк' without understanding the precise microbiological context. It is not a generic word for 'germ' or 'bacteria'.
Common Mistakes
- Pronouncing it like 'cock-us' with a hard /k/ sound; the first 'c' is hard /k/, the second is soft /s/.
- Using it as a general term for any bacteria; it is a specific shape classification.
Practice
Quiz
What is the plural form of 'coccus'?
FAQ
Frequently Asked Questions
No. 'Coccus' describes the spherical shape. 'Staphylococcus' is a specific genus of bacteria that are cocci arranged in clusters.
It is highly unlikely. It is a specialized term used almost exclusively in scientific or medical contexts.
In bacteriology, the primary antonym is 'bacillus,' referring to a rod-shaped bacterium.
In British English: /ˈkɒkəs/ (KOK-uhs). In American English: /ˈkɑːkəs/ (KAH-kuhs).