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trilobite

C1
UK/ˈtraɪ.lə.baɪt/US/ˈtraɪ.ləˌbaɪt/

Scientific/Academic

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Definition

Meaning

An extinct marine arthropod from the Palaeozoic era, having a body divided into three longitudinal lobes.

Fossil remains of the extinct trilobite, commonly collected and studied in palaeontology.

Linguistics

Semantic Notes

Purely a noun; has no modern living counterpart. The term is used almost exclusively in palaeontological, geological, and sometimes broader scientific or educational contexts.

Dialectal Variation

British vs American Usage

Differences

No lexical difference. Usage is identical in both varieties of English.

Connotations

Neutral and technical in both dialects.

Frequency

Extremely low frequency in general language, used only in specific scientific or educational contexts in both regions.

Vocabulary

Collocations

strong
fossil trilobiteCambrian trilobitetrilobite fossilextinct trilobite
medium
specimen of a trilobitestudy trilobitespreserved trilobite
weak
ancient trilobitesmall trilobitecomplete trilobite

Grammar

Valency Patterns

find a trilobiteidentify a trilobitecollect trilobites

Vocabulary

Synonyms

Neutral

fossil arthropodpalaeozoic fossil

Weak

sea scorpion (historic/inaccurate)

Vocabulary

Antonyms

living arthropodmodern crustacean

Usage

Context Usage

Business

Not used.

Academic

Common in palaeontology, geology, and evolutionary biology papers and textbooks.

Everyday

Very rare; might appear in museum visits, documentaries, or casual conversations about fossils.

Technical

Core term in palaeontology. Used with precise morphological descriptors (e.g., 'pygidium', 'glabella').

Examples

By Part of Speech

adjective

British English

  • The trilobite fauna of the Welsh basin is diverse.

American English

  • The trilobite assemblage differs between these shale layers.

Examples

By CEFR Level

A2
  • We saw a trilobite in the museum.
B1
  • Trilobites lived in the sea a very long time ago.
B2
  • The fossil collector was thrilled to find a well-preserved trilobite in the limestone.
C1
  • Phacops is a genus of trilobite characterised by its distinctive schizochroal eyes, which are a subject of considerable evolutionary study.

Learning

Memory Aids

Mnemonic

Think TRI-LOBE-ite: its body had THREE (TRI) main LOBES, and we find it in rocks (ITE, a common suffix for minerals/fossils).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Прямой перевод 'трилобит' (trilobit) корректный и единственный. Ложных друзей нет.

Common Mistakes

  • Pronouncing it as /trɪˈlɒbaɪt/ (incorrect stress).
  • Using it as a verb (e.g., 'to trilobite').

Practice

Quiz

Fill in the gap
A common index fossil for the Cambrian period is the .
Multiple Choice

What is a trilobite?

FAQ

Frequently Asked Questions

Yes, distantly. Both trilobites and insects are arthropods, sharing a segmented body and exoskeleton, but they belong to different subphyla.

Trilobites went extinct at the end of the Permian period, approximately 252 million years ago, in the largest mass extinction event in Earth's history.

The standard pronunciation is /ˈtraɪ.lə.baɪt/, with the primary stress on the first syllable: TRY-luh-bite.

No, 'trilobite' is exclusively a noun. There is no verb form such as 'to trilobite' in standard English.