1. a small opening in the outer covering of a plant ovule through which the pollen tube enters during fertilization
Usage: botany
2. a small opening in the shell or membrane of an egg through which sperm enters during fertilization
Usage: biology

Examples

• The pollen tube grows toward the micropyle of the ovule.
• Fertilization occurs when sperm enters through the micropyle.
• The micropyle is essential for successful plant reproduction.
• In fish eggs, the micropyle allows sperm to penetrate the egg membrane.
• Botanists study the structure of the micropyle under a microscope.
• The micropyle closes after fertilization to protect the developing embryo.