noun
steamer pot; casserole dish for steaming
Refers to a pot or dish used for steaming food, often a lidded ceramic or metal vessel.
蒸し鍋で野菜を蒸すと、栄養が逃げにくい。
When you steam vegetables in a steamer pot, the nutrients are less likely to escape.
蒸し器 is a general steamer (often a tiered metal or bamboo steamer), while 蒸し鍋 specifically refers to a pot or casserole dish used for steaming.
Compound of 蒸し (steaming) + 鍋 (pot).