1. A liquid preparation made by boiling a substance (usually herbs, roots, or bark) in water to extract its active constituents
The herbalist prepared a decoction of willow bark to reduce fever.
A ervanária preparou uma decocção de casca de salgueiro para reduzir a febre.
2. The act or process of boiling down a substance to extract its essence or properties
Through careful decoction, the medicinal properties of the plant were concentrated.
Através da decocção cuidadosa, as propriedades medicinais da planta foram concentradas.