decoction
/dɪˈkɒkʃən/noun
1- the liquor resulting from concentrating the essence of a substance by heating or boiling, especially a medicinal preparation made from a plant浓缩液, 煎剂, 浓汁（尤指从植物中提取的药液）：
a decoction of a root.
根煎剂。
1.1
- mass noun the action or process of extracting the essence of something熬; 煎。
词源
late Middle English: from late Latin decoctio（n-）, from decoquere 'boil down' （see DECOCT）.