noun
small handleless teacup
A small, handleless cup used for drinking Japanese green tea. Often part of a set with a matching lid (湯飲み).
湯飲み茶碗に熱いお茶を注いだ。
I poured hot tea into the teacup.
Variant using 呑 (a non-standard but occasionally seen character for 'drink').
Compound of 湯 (hot water), 飲み (drinking), and 茶碗 (teacup/bowl).