1. 残羹剩饭；剩菜；吃剩的食物
You can refer to food that has not been eaten after a meal as leftovers .

2. 剩余的；用剩的；吃剩的
You use leftover to describe an amount of something that remains after the rest of it has been used or eaten.

3. 残存物；遗留物
If you say that something is a leftover from a past period of time, you mean that it has its origin there and still exists even though most other things connected to that time have disappeared.

1. a small part or portion that remains after the main part no longer exists

Synonym: remnant