noun
Refers to the main carbohydrate source in a meal, such as rice, bread, or noodles, as opposed to side dishes.
日本人の主食は米です。
The staple food of Japanese people is rice.
パンが主食の国もあります。
There are also countries where bread is the staple food.
Compound of 主 (しゅ, 'main') and 食 (しょく, 'food' or 'meal'). The reading is on'yomi.