noun
undiluted solution; stock solution; concentrate
Refers to a liquid before dilution, often in industrial, laboratory, or household contexts (e.g., cleaning agents, chemicals).
この洗剤は原液のまま使わず、必ず水で薄めてください。
Do not use this detergent undiluted; always dilute it with water.
実験では、原液を10倍に希釈して使
In the experiment, the stock solution was diluted tenfold before use.