For Zona Pellucida we have terms and definitions in 3 topics. The topics are Developmental Psychology, Fertility and Horse Health.

The gelatinous covering of the egg.
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The translucent belt consisting of a noncellular layer that is deposited at the periphery of the egg while it is in the ovary and continues to surround the egg and the conceptus until the stage of implantation, during which time the embryo "hatches" outside the zona pellucida
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Thick, transparent outer envelope or casing that surrounds an ovum (egg).
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