acinus
Low (C2+ / Specialized)Formal, Technical, Scientific
Definition
Meaning
A small sac-like cavity or terminal division of a gland, especially in the pancreas or liver.
In botany, it can refer to a small, berry-like fruit or drupelet in a compound fruit like a raspberry, or more generally to any small, rounded terminal cluster.
Linguistics
Semantic Notes
Primarily a term from anatomy, histology, and botany. Its usage is almost exclusively restricted to scientific and medical contexts. The plural forms are 'acini' (Latin) or 'acinuses' (Anglicized).
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. The primary distinction lies in pronunciation.
Connotations
Purely technical with no regional connotative differences.
Frequency
Equally rare in both dialects, confined to specialist fields.
Vocabulary
Collocations
Grammar
Valency Patterns
The [adjective] acinus (e.g., hepatic, pancreatic)An acinus of the [organ name]Acini are found in...Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Not used.
Academic
Used in medical, biological, and anatomical textbooks and research papers.
Everyday
Virtually never used.
Technical
The primary context. Describes the functional unit of exocrine glands (e.g., pancreas, salivary, mammary) and liver architecture.
Examples
By Part of Speech
adjective
British English
- acinar
- acinous
American English
- acinar
- acinous
Examples
By CEFR Level
- Under the microscope, the tissue was composed of many small sacs called acini.
- Each acinus in the salivary gland produces saliva.
- The hepatic acinus is a diamond-shaped mass of liver tissue supplied by a terminal branch of the portal vein.
- Chronic inflammation can lead to the destruction of the pancreatic acini, impairing digestion.
Learning
Memory Aids
Mnemonic
Think: 'A tiny SACK-IN-US' -> a small sac-like structure inside us (the body).
Conceptual Metaphor
A BERRY ON A BRANCH (botanical); a GRAPE IN A BUNCH (anatomical - acini cluster like grapes).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'ацинус' (direct transliteration, correct but rare). More common Russian equivalents are 'долька' (lobule) or 'концевой отдел железы' (terminal part of a gland).
Common Mistakes
- Mispronouncing as /əˈsaɪ.nəs/ or /ˈæk.ɪ.nəs/.
- Using it in non-scientific contexts.
- Confusing with 'alveolus' (though related, alveolus is specifically for lung and tooth sockets).
Practice
Quiz
In which of these fruits might you find a structure botanically termed an 'acinus'?
FAQ
Frequently Asked Questions
No, it is a highly specialized term used almost exclusively in medical, biological, and anatomical contexts.
The correct Latin plural is 'acini' (/ˈæs.ɪ.naɪ/ or /ˈæs.ə.naɪ/). The Anglicized plural 'acinuses' is also accepted but less common in technical writing.
Both refer to small cavities. 'Acinus' typically refers to the terminal sac of an exocrine gland. 'Alveolus' specifically refers to the air sac in the lungs or the socket of a tooth.
It would be highly unusual and likely misunderstood unless speaking with a specialist (e.g., a doctor or biologist).