myasthenia
UK[ˌmaɪ.əsˈθiː.ni.ə]US[ˌmaɪ.əsˈθiː.ni.ə]
n
a condition causing abnormal weakness of certain muscles, which is typically worsened by activity and improved by rest.
Morpheme Breakdown
my
asthenia
my
muscle
asthenia
weakness
Etymology
the term 'myasthenia' is a modern medical neologism constructed directly from ancient greek components to describe a specific pathological condition. it combines 'mys', meaning muscle, with 'astheneia', a classical term for weakness or lack of strength. the logic is perfectly literal, translating directly to "muscle weakness." this transparent compounding follows a long tradition in scientific and medical terminology, where greek and latin roots are repurposed to create precise, internationally understood terms for new clinical observations, in this case characterizing the core symptom of the disorder.
Analysis
Structure: my (muscle) + asthenia (weakness)
my- from greek 'mys' (muscle). asthenia from greek 'astheneia' (weakness), itself from 'a-' (without, not) + 'sthenos' (strength).
Examples
myasthenia gravis is an autoimmune disorder that disrupts communication between nerves and muscles.
the primary symptom of myasthenia is fatigable weakness, often affecting the eyes, face, and throat.
diagnosis of myasthenia may involve a blood test for specific antibodies or a nerve conduction study.