What is the meaning of tincture?

noun

• A substances that colors metals.
• An indication that something has been present.
  • usage: "there wasn't a trace of evidence for the claim"; "a tincture of condescension"
  • synonyms: trace, vestige, shadow
• A quality of a given color that differs slightly from another color.
  • usage: "after several trials he mixed the shade of pink that she wanted"
  • synonyms: shade, tint, tone
• Pharmacology) a medicine consisting of an extract in an alcohol solution. (

verb

• Fill, as with a certain quality.
  • usage: "The heavy traffic tinctures the air with carbon monoxide"
  • synonyms: impregnate, infuse, instill
• Stain or tint with a color.
  • usage: "The leaves were tinctured with a bright red"