Rind (noun)

1. The hard outer layer of some fruit or vegetables, especially citrus fruit.
2. The outer layer of a cheese that is cut off and discarded before eating.

Origin:

Middle english: from old english rind "bark", of germanic origin; related to dutch rind and german rinde.

Examples:

1. The lemon rind added a nice flavor to the cake.
2. The cheese rind was a good source of calcium.
3. The orange rind was candied and used as a decoration.
4. The rind of the melon was thick and difficult to cut.
5. The rind of the cheese was moldy and had to be thrown away.