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ecdysone

C2
UK/ˈɛkdɪsəʊn/US/ˈɛkdɪsoʊn/ or /ɛkˈdaɪsoʊn/

Scientific/Technical

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Definition

Meaning

A hormone in insects and some other arthropods that triggers moulting and metamorphosis.

A steroid hormone that regulates the shedding of the exoskeleton (ecdysis) and other developmental stages in arthropods; also found in some plants (phytoecdysteroids).

Linguistics

Semantic Notes

The term is specifically used in entomology, endocrinology, and developmental biology. It is a core concept in arthropod physiology and is not used metaphorically.

Dialectal Variation

British vs American Usage

Differences

No significant differences in meaning or usage; spelling is identical.

Connotations

Exclusively scientific; no cultural connotations.

Frequency

Extremely rare outside academic and technical contexts in both varieties.

Vocabulary

Collocations

strong
moulting hormonejuvenile hormone20-hydroxyecdysonephytoecdysteroidsteroid hormone
medium
secrete ecdysonelevels of ecdysoneecdysone receptorresponse to ecdysone
weak
high ecdysonepure ecdysonesynthetic ecdysoneeffect of ecdysone

Grammar

Valency Patterns

[The gland] secretes ecdysone.[Ecdysone] triggers [process].[Concentration] of ecdysone rises.[Researchers] studied the effects of ecdysone on [species].

Vocabulary

Synonyms

Neutral

moulting hormone

Weak

developmental regulator

Vocabulary

Antonyms

juvenile hormone (functionally antagonistic in insect development)

Usage

Context Usage

Business

Not used.

Academic

Common in biology, entomology, and endocrinology research papers.

Everyday

Never used.

Technical

Essential term in insect rearing, pesticide development, and comparative endocrinology.

Examples

By Part of Speech

adjective

British English

  • The ecdysone pathway was analysed.
  • Ecdysone-related genes were upregulated.

American English

  • The ecdysone receptor was cloned.
  • Ecdysone signaling is crucial.

Examples

By CEFR Level

B2
  • Scientists study ecdysone to understand insect growth.
  • The level of ecdysone increases before moulting.
C1
  • The precise titres of ecdysone during the larval instar determine the timing of the next moult.
  • Application of exogenous ecdysone can prematurely induce metamorphosis in the silkworm.

Learning

Memory Aids

Mnemonic

Think: "ECDYSone helps an insect EXIT its skin." (Ecdysis = shedding; -one = hormone suffix).

Conceptual Metaphor

Developmental timer / Molting switch.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • No direct common Russian equivalent. The term "экдизон" is the direct transliteration used in scientific contexts. Avoid confusing it with more general terms for hormones like "гормон".

Common Mistakes

  • Mispronouncing it as /ekˈdaɪzɒn/.
  • Misspelling as 'ecdyson' (without final 'e').
  • Using it to refer to hormones in vertebrates.

Practice

Quiz

Fill in the gap
In order to grow, an insect must produce to initiate the moulting process.
Multiple Choice

What is the primary function of ecdysone in arthropods?

FAQ

Frequently Asked Questions

No, ecdysone is specific to arthropods (like insects and crustaceans) and some plants. Humans have different steroid hormones.

Yes, synthetic compounds that mimic or disrupt ecdysone signaling (ecdysone agonists) are used in some insect growth regulator pesticides.

Ecdysone is often the precursor hormone secreted by glands. It is converted in many tissues to the more active form, 20-hydroxyecdysone, which directly binds to receptors.

It is a model system for studying hormone-regulated gene expression, developmental timing, and the evolution of endocrine systems.