Standard Lemma guide

myasthenia

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

Abnormal weakness of the muscles; but especially myasthenia gravis.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

any muscular weakness

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: physical condition, physiological state, physiological condition

3

noun

Meaning 3

a chronic progressive disease characterized by chronic fatigue and muscular weakness (especially in the face and neck); caused by a deficiency of acetylcholine at the neuromuscular junctions

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: myasthenia gravis

Antonyms: none provided

Broader terms: disease of the neuromuscular junction, autoimmune disease, autoimmune disorder

History

Etymology

From my- (“relating to muscle”) + asthenia (“weakness”), from Ancient Greek ἀσθένεια (asthéneia, “weakness”). By surface analysis, my- (“muscle”) + a- (“not”) + sthen- (“strength”) + -ia (“disease”).