A crust formed over a wound or sore.

痂。

A disease of sheep.

羊身上之疥癣。

A disease of plants in which dark-colored spots of mold appear.

植物之菌病。

A workman who refuses to join a strike, or who takes the place abandoned by a striker.

【俚】不愿参加罢工者；递补罢工者(在工厂)之职位的人。

To act as a scab.

破坏罢工。