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倍に希釈して使用した。
In the experiment, the stock solution was diluted tenfold before use.
Compound of 原 (げん, 'original') and 液 (えき, 'liquid').