Definitions

1. noun

A small opening or pore, especially one in the seed coat of a plant through which the pollen tube enters during fertilization.

“The micropyle of the plant seed allows for the entry of the pollen tube during fertilization.”

2. noun

A small opening in the eye of a fly or other insect through which the sperm enters during fertilization.

“The micropyle of the fly’s eye is the small opening through which the sperm enters during fertilization.”