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sac hit

C1/C2
UK/sæk/US/sæk/

Specialized, Technical, Scientific

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Definition

Meaning

A bag-like structure in a plant, animal, or fungus, typically one containing fluid, air, or another substance.

Any pouch, cyst, or fluid-filled cavity within an organism; in anatomy and biology, a membranous structure resembling a bag or pouch. In non-technical contexts, sometimes used metaphorically for any container-like object.

Linguistics

Semantic Notes

Primarily used in biological, anatomical, and medical contexts. It is a highly specific term, not common in everyday language unless discussing anatomy, biology, or certain medical conditions (e.g., amniotic sac, lacrimal sac).

Dialectal Variation

British vs American Usage

Differences

No significant differences in meaning or primary usage. Pronunciation differences are minor (see IPA).

Connotations

Identical technical/scientific connotations in both varieties.

Frequency

Equally low-frequency and specialized in both BrE and AmE.

Vocabulary

Collocations

strong
amniotic saclacrimal sacair sacyolk sacembryonic sac
medium
fluid-filled sacmembranous sacsynovial saccystic sac
weak
small sacprotective sacinner sac

Grammar

Valency Patterns

[adjective] + sacsac + of + [noun (substance)]

Vocabulary

Synonyms

Strong

cyst (in pathological contexts)vesicle (small)

Neutral

pouchcystvesiclebladderbursa

Weak

pocketcavitybag

Vocabulary

Antonyms

solid massducttubecanal

Phrases

Idioms & Phrases

  • “[No common idioms. Highly technical term.]”

Usage

Context Usage

Business

Virtually never used.

Academic

Common in biology, anatomy, zoology, botany, and medical science texts.

Everyday

Very rare. Might be encountered in discussions of pregnancy (amniotic sac) or specific health issues.

Technical

The primary register. Used with precision to describe specific anatomical structures.

Examples

By Part of Speech

verb

British English

  • [Not used as a verb]

American English

  • [Not used as a verb]

adverb

British English

  • [Not used as an adverb]

American English

  • [Not used as an adverb]

adjective

British English

  • [Not used as a standalone adjective. Used in compounds: sac-like.]

American English

  • [Not used as a standalone adjective. Used in compounds: sac-like.]

Examples

By CEFR Level

A2
  • [Level too low for this specialized term]
B1
  • The doctor explained that the baby grows inside a fluid-filled sac.
C1
  • Inflammation of the synovial sac, or bursitis, can cause significant joint pain and stiffness.

Learning

Memory Aids

Mnemonic

Think of a SACk, but inside your body. An 'Air SAC' in a bird is like a tiny internal sack for air.

Conceptual Metaphor

CONTAINER (for biological fluids/structures); BIOLOGICAL POUCH.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Не путать с 'мешок' (bag/sack) в бытовом смысле. 'Sac' — это почти всегда внутренняя, биологическая структура. Русский эквивалент — 'сумка' (слезная сумка), 'мешок' (амниотический мешок), 'пузырь' (желточный пузырь). Контекст определяет перевод.

Common Mistakes

  • Using 'sac' for a man-made bag (use 'sack' or 'bag').
  • Mispronouncing as /seɪk/ (like 'sake'); correct is /sæk/ (like 'sack').
  • Confusing 'sac' with 'cyst' (a cyst is a pathological sac).

Practice

Quiz

Fill in the gap
In human development, the embryo is protected and nourished within the amniotic .
Multiple Choice

In which context is the word 'sac' most appropriately used?

FAQ

Frequently Asked Questions

No. 'Sack' is a common noun for a large bag. 'Sac' is a specialized biological/anatomical term for a pouch-like structure in an organism.

It is pronounced exactly like 'sack' (/sæk/), not like 'sake' (/seɪk/).

Very rarely. Its use is almost entirely confined to scientific, medical, and anatomical discussions (e.g., amniotic sac, tear sac).

The lacrimal sac, which collects tears from the eye before they drain into the nasal cavity, is a classic example.