This is the 9131st most frequent Japanese word.
無水
"無水" means "without water" or "anhydrous."
Here, '無水' is used as an adjective modifying '調理器', meaning 'waterless cooker', emphasizing that the cooking device operates without water.
無水調理器を使用して料理を作ります。
I use a waterless cooker to prepare dishes.
In this sentence, '無水' describes 'エタノール', referring to 'anhydrous ethanol', a form of ethanol without water content.
無水エタノールは純度が高いアルコールです。
Anhydrous ethanol is high-purity alcohol.
The term '無水状態' is used to indicate an 'anhydrous state', meaning conditions where no water is present.