endoplasmic reticulum: meaning, definition, pronunciation and examples
RareTechnical/Scientific
Quick answer
What does “endoplasmic reticulum” mean?
A continuous membrane system within the cytoplasm of a eukaryotic cell, involved in the synthesis, folding, modification, and transport of proteins.
Audio
Pronunciation
Definition
Meaning and Definition
A continuous membrane system within the cytoplasm of a eukaryotic cell, involved in the synthesis, folding, modification, and transport of proteins.
An extensive network of tubules and flattened sacs (cisternae) that forms a major part of the endomembrane system. It exists in two forms: rough (with ribosomes) for protein synthesis and smooth (without ribosomes) for lipid synthesis and detoxification.
Dialectal Variation
British vs American Usage
Differences
No lexical or orthographic differences. Pronunciation differences are minor, primarily in secondary stress and vowel quality (see IPA).
Connotations
None beyond the strict scientific definition.
Frequency
Equally rare in both varieties, confined to scientific discourse.
Grammar
How to Use “endoplasmic reticulum” in a Sentence
The endoplasmic reticulum [verb, e.g., synthesises, folds, transports] proteins.Proteins are targeted to the endoplasmic reticulum.Ribosomes are attached to the endoplasmic reticulum.Vocabulary
Collocations
Examples
Examples of “endoplasmic reticulum” in a Sentence
verb
British English
- The protein is then endoplasmic reticulum-associated for folding.
- The enzyme localises to the endoplasmic reticulum membrane.
American English
- The protein is then endoplasmic reticulum-associated for folding.
- The enzyme localizes to the endoplasmic reticulum membrane.
adjective
British English
- The endoplasmic-reticulum-specific signal was clear.
- They studied endoplasmic reticulum morphology.
American English
- The endoplasmic-reticulum-specific signal was clear.
- They studied endoplasmic reticulum morphology.
Usage
Meaning in Context
Business
Never used.
Academic
Exclusively used in biology, biochemistry, and medicine textbooks and research papers.
Everyday
Virtually never used.
Technical
Core term in cell biology labs, research discussions, and technical manuals.
Vocabulary
Synonyms of “endoplasmic reticulum”
Neutral
Weak
Watch out
Common Mistakes When Using “endoplasmic reticulum”
- Misspelling as 'endoplastic reticulum'.
- Confusing 'endoplasmic' with 'endoplastic' or 'endoplasm'.
- Using as a countable noun (e.g., 'an endoplasmic reticulum') – it's typically used as an uncountable or singular entity within a cell.
FAQ
Frequently Asked Questions
No. The endoplasmic reticulum is a defining feature of eukaryotic cells; prokaryotes (bacteria and archaea) lack membrane-bound organelles like the ER.
It comes from Latin 'reticulum', meaning 'a little net', describing its network-like structure within the cell.
No eukaryotic cell can survive without some form of endoplasmic reticulum, as it is essential for protein and lipid synthesis, calcium storage, and detoxification. Mature red blood cells in mammals are an exception, as they lose all organelles, including the ER, upon maturation.
No. They are distinct, interconnected organelles. The ER synthesises and initially processes molecules (proteins/lipids), which are then transported to the Golgi apparatus for further modification, sorting, and packaging for delivery.
A continuous membrane system within the cytoplasm of a eukaryotic cell, involved in the synthesis, folding, modification, and transport of proteins.
Endoplasmic reticulum is usually technical/scientific in register.
Endoplasmic reticulum: in British English it is pronounced /ˌɛn.də(ʊ)ˌplæz.mɪk rɪˈtɪk.jə.ləm/, and in American English it is pronounced /ˌen.doʊˌplæz.mɪk rəˈtɪk.jə.ləm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a PLASMA (cytoplasm) network that's ENDlessly working on proteins inside a cell – an ENDO-PLASMIC RETICULUM. Or: 'The cell's internal postal system: the ENDOplasmic REticulum TRAnsports.'
Conceptual Metaphor
A factory assembly line (rough ER for protein production); a specialized workshop or warehouse (smooth ER for lipids and detox).
Practice
Quiz
What is the primary functional difference between rough and smooth endoplasmic reticulum?