noun
bidet toilet seat with warm water; warm-water washlet
Refers to a toilet seat equipped with a warm-water spray for personal cleansing, commonly known as a Washlet (a trademark of TOTO).
日本のホテルには温水洗浄便座がよく設置されている。
Hotels in Japan often have bidet toilet seats with warm water.
Compound of 温水 (warm water), 洗浄 (washing/cleansing), and 便座 (toilet seat).