tincture - definition and synonyms

noun 

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/ˈtɪŋktʃə(r)/
singulartincture
pluraltinctures
  1. 1
    [countable/uncountable] a medicine made by mixing a small amount of a drug with alcohol
  2. 2
    [singular] literary a small amount of a particular quality

    There wasn’t a tincture of regret in his voice.