noun
Colloquial and slightly humorous term for a completely bald head, likening it to the smooth surface of a kettle (やかん). Often used in casual conversation.
彼は若いのにやかん頭だ。
He's young but already has a bald head.
やかん頭を隠すために帽子をかぶっている。
He wears a hat to hide his bald head.