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ink sac

Low
UK/ˈɪŋk ˌsæk/US/ˈɪŋk ˌsæk/

Scientific / Technical / Zoological

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Definition

Meaning

An anatomical organ found in some cephalopods (e.g., squid, octopus, cuttlefish) that produces and stores ink, which is ejected as a defense mechanism.

Sometimes used metaphorically to refer to a source of ink or inspiration, particularly in poetic or artistic contexts, though this is very rare.

Linguistics

Semantic Notes

A compound noun. Always used as a singular, countable noun. Its use is almost entirely restricted to biology, marine zoology, and culinary contexts (when preparing cephalopods).

Dialectal Variation

British vs American Usage

Differences

No significant difference in meaning or usage. Both varieties use the term identically in technical contexts.

Connotations

Neutral and technical in both varieties.

Frequency

Equally low frequency in both UK and US English, confined to specific fields.

Vocabulary

Collocations

strong
squid ink saccuttlefish ink sacremove the ink saccontains an ink sac
medium
large ink sacruptured ink sacthe creature's ink sac
weak
careful with the ink saclocated near the ink sacfull ink sac

Grammar

Valency Patterns

The [cephalopod] has an ink sac.Remove the ink sac from the [squid/cuttlefish].The ink sac [ruptured/released] a dark cloud.

Vocabulary

Synonyms

Neutral

ink gland

Weak

ink reservoirink pouch

Usage

Context Usage

Business

Not used.

Academic

Used in biology and marine science papers to describe cephalopod anatomy.

Everyday

Very rare; might be encountered in cooking instructions for preparing squid.

Technical

Standard term in zoology, marine biology, and fisheries.

Examples

By CEFR Level

A2
  • The squid has an ink sac.
B1
  • When threatened, the squid uses its ink sac to create a dark cloud in the water.
B2
  • To prepare the cuttlefish for cooking, you must carefully remove the ink sac without rupturing it.
C1
  • The study focused on the neuromuscular control of the ink sac's ejection mechanism in various cephalopod species.

Learning

Memory Aids

Mnemonic

Think of a squid's 'sac' or bag, filled with 'ink' for a quick escape – like a living ink cartridge.

Conceptual Metaphor

A NATURAL DEFENSE IS AN INK CLOUD (source: the ink sac's function).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Avoid translating 'sac' as 'мешок' in isolation; the established biological term is 'чернильный мешок'. Do not confuse with 'чернильница' (inkwell).

Common Mistakes

  • Misspelling as 'inksack' or 'ink-sack' (standard is two words: 'ink sac').
  • Using plural 'inks sacs' instead of 'ink sacs'.
  • Assuming it exists in animals other than cephalopods.

Practice

Quiz

Fill in the gap
When preparing fresh squid, chefs are careful not to puncture the , as it will release a black liquid.
Multiple Choice

In which animal would you find an ink sac?

FAQ

Frequently Asked Questions

No. The ink sac is the organ that produces and stores the ink. The ink is the actual substance released.

Most do, but some deep-sea species that live in darkness have lost this organ through evolution.

Yes, squid and cuttlefish ink is used as a safe food colouring and flavouring in dishes like pasta and risotto.

The standard spelling in scientific and reference texts is as two separate words: 'ink sac'.