Term: zona pellucida: thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
Broader: thing: a separate and self-contained entity | Unrelated: eastern red-backed salamander: common salamander of eastern North America
Broader: thing: a separate and self-contained entity | Unrelated: abramis: European fishes
Broader: thing: a separate and self-contained entity | Unrelated: devotional: a short religious service
Broader: thing: a separate and self-contained entity | Unrelated: chain wrench: another name for chain tongs
Broader: thing: a separate and self-contained entity | Unrelated: point: the precise location of something; a spatially limited location
Broader: thing: a separate and self-contained entity | Unrelated: primness: excessive or affected modesty
Broader: thing: a separate and self-contained entity | Unrelated: aberration: an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
Broader: thing: a separate and self-contained entity | Unrelated: punching bag: a person on whom another person vents their anger
Broader: thing: a separate and self-contained entity | Unrelated: callinectes: New World blue crabs
Broader: thing: a separate and self-contained entity | Unrelated: outfit: any cohesive unit such as a military company