of a female animal, having had its ovaries (= the parts that produce eggs) removed so that it cannot produce young animals

There are probably thousands of dangerous dogs out there that don't have permits and aren't spayed or neutered. 外面可能有成千上万只危险的狗，它们没有许可证，也没有被绝育或去势。

He reported that the donor eggs would come largely from the ovaries of spayed dogs and cats. 他报告说，捐赠的卵子主要来自绝育猫狗的卵巢。

Compare: altered castratedneutered