bidet toilet; washlet
A toilet with an integrated bidet function for washing. ウォシュレット is a trademark of TOTO, but シャワートイレ is a generic term.
wasei-eigo (Japanese-coined English), from shower toilet
Hotels in Japan usually have a bidet toilet.
The new apartment comes with a bidet toilet.
Variant with interpunct; less common in everyday use.
Wasei-eigo from English 'shower' + 'toilet'.