Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine


A layer of glycoproteins and another substance which surrounds an egg (ovum), just external of the egg's cell membrane. The coat protects the egg, and for organisms which practice outside fertilization (fertilization external of the parents' bodies) it can help prevent the sperm of another species from entering the egg. For the eggs of mammals, the egg coat is called the zona pellucida and for sea urchins (a public learn organism for developmental biologists) it is called the vitelline layer.
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