noun
mochi shop; mochi seller
Refers to a store that sells mochi (rice cakes) or the person who runs it. The context usually makes the meaning clear.
正月前に餅屋で鏡餅を買った。
I bought a kagami mochi at a mochi shop before New Year's.
あの餅屋の主人はとても親切だ。
The owner of that mochi shop is very kind.