noun
Refers to the wall-mounted electric device in public restrooms that blows warm air to dry hands.
トイレのハンドドライヤーが故障していた。
The hand dryer in the restroom was broken.
noun
hand-held hair dryer
Less common usage; typically refers to a portable hair dryer. Often called ヘアドライヤー or simply ドライヤー in modern Japanese.
I bought a small hand-held hair dryer for travel.