apple of (one's) eye

A deciduous Eurasian tree (Malus pumila) having alternate simple leaves and white or pink flowers.

The firm, edible, usually rounded fruit of this tree.

Any of several other plants, especially those with fruits suggestive of the apple, such as the crab apple or custard apple.

The fruit of any of these plants.

Any of several other plants, especially those with fruits suggestive of the apple, such as the crab apple or custard apple.

The fruit of any of these plants.