tonic

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tonic (ton-ik)
1. adj. a. relating to normal muscle tone. b. marked by continuous tension (contraction), e.g. a tonic muscle spasm. t. pupil (Adie's pupil) a pupil that is dilated as a result of damage to the nerves supplying the ciliary muscle and iris.

2. n. a medicinal substance purporting to increase vigour and liveliness and produce a feeling of wellbeing: beneficial effects of tonics are probably due to their placebo action.

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