A muscular spasm or sustained involuntary muscle contraction, often used in medical contexts to describe abnormal tension.
From Greek 'entasis' (stretching, tension) via medical terminology. The '-ia' ending is typical of medical conditions and states in scientific Latin.
Medical Greek and Latin gave physicians a universal language so a doctor in Argentina, Russia, or Japan could read the same diagnostic term—'entasia' joins thousands of '-ia' conditions (anemia, aphasia, amnesia) in this shared scientific vocabulary.
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