thylakoid: meaning, definition, pronunciation and examples
Very Low (C2)Scientific/Technical
Quick answer
What does “thylakoid” mean?
A membrane-bound compartment inside chloroplasts and cyanobacteria. It is the site of the light-dependent reactions of photosynthesis.
Audio
Pronunciation
Definition
Meaning and Definition
A membrane-bound compartment inside chloroplasts and cyanobacteria. It is the site of the light-dependent reactions of photosynthesis.
Structurally, a thylakoid is a flattened sac-like membrane, often stacked to form grana (singular: granum), which are interconnected by stromal lamellae. The thylakoid membrane contains chlorophyll and other pigments and proteins necessary for photosynthesis.
Dialectal Variation
British vs American Usage
Differences
No difference in meaning, spelling, or pronunciation. The concept is identical in both varieties of English.
Connotations
None beyond the strict scientific definition.
Frequency
Extremely rare outside academic or technical biology contexts in both the UK and US.
Grammar
How to Use “thylakoid” in a Sentence
[Adj] thylakoidthylakoid [noun][Verb] in/on the thylakoidVocabulary
Collocations
Examples
Examples of “thylakoid” in a Sentence
adjective
British English
- The thylakoid membrane proteins were isolated for analysis.
- Researchers observed distinct thylakoid stacking patterns.
American English
- They studied the thylakoid lumen pH.
- The model predicts thylakoid membrane dynamics.
Usage
Meaning in Context
Academic
Essential term in plant biology, biochemistry, and botany papers and textbooks.
Everyday
Virtually never used in everyday conversation.
Technical
Core term for describing the structure and function of chloroplasts in research and education.
Watch out
Common Mistakes When Using “thylakoid”
- Misspelling as 'thylacoid', 'thylokoid', or 'thylocoid'.
- Pronouncing the 'y' as a short /ɪ/ (as in 'thin') instead of long /aɪ/ (as in 'thigh').
- Using it as a countable noun without a clear article (e.g., 'Thylakoids are found in chloroplast' instead of '...in *a* chloroplast' or '...in chloroplasts').
FAQ
Frequently Asked Questions
No. A chloroplast is the larger organelle. Thylakoids are the smaller, membrane-bound compartments found inside the chloroplast.
Yes. Thylakoids are also found in cyanobacteria (blue-green algae), which are prokaryotic organisms.
A thylakoid is a single membrane sac. A granum (plural: grana) is a stack of multiple thylakoids, resembling a pile of coins.
It contains all the chlorophyll, electron transport chains, and ATP synthase necessary to convert light energy into chemical energy (ATP and NADPH).
A membrane-bound compartment inside chloroplasts and cyanobacteria. It is the site of the light-dependent reactions of photosynthesis.
Thylakoid is usually scientific/technical in register.
Thylakoid: in British English it is pronounced /ˈθaɪləkɔɪd/, and in American English it is pronounced /ˈθaɪləkɔɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think 'THY-LAKES' inside a cell: Thy-lak-oids are like tiny, interconnected membrane lakes (saccules) where sunlight is captured.
Conceptual Metaphor
A thylakoid is like a solar panel array within a factory (the chloroplast). Each thylakoid sac is a panel that captures light energy to power the factory's production (sugars).
Practice
Quiz
What is the primary function of the thylakoid?