酸橙 classically refers to the bitter / Seville orange (Citrus aurantium) whose dried peel
枳壳 and unripe fruit
枳实 are standard TCM herbs. In modern cooking contexts it is also loosely used for "lime" (which botanists call
青柠 qīngníng). Dictionaries like CC-CEDICT gloss it as "lime"; use context.