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1.As much as a wineglass will hold; enough to fill a wineglass. It is usually reckoned at two fluid ounces, or four tablespoonfuls.
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References in classic literature ?
Sabin, after a moment's hesitation, took a phial from his pocket and poured a few drops into a wineglassful of water.
It was a long while since he had taken vodka and it had an effect upon him at once, though he only drank a wineglassful.
Infuse one ounce of leaves to one pint of boiling water and take in wineglassful doses twice a day.