piece of bread; slice of bread
Refers to a single piece or slice of bread, often used when counting or describing a portion.
I ate a slice of bread for breakfast.
Please spread butter on the piece of bread.
Compound of パン (pan, 'bread', from Portuguese pão) and 切れ (kire, 'piece, slice', the continuative form of 切れる kireru, 'to be cut').