Describing something that counteracts weakness or lack of strength, particularly in medical contexts.
From Greek 'anti-' (against) + 'asthenes' (weak, from 'a-' without + 'sthenos' strength), literally meaning 'against weakness.'
Ancient doctors would classify tonics and strength-building foods as 'antasthenic' — it's the medical version of saying something will give you energy or make you stronger.
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