What is (a) A Graafian follicle; any sac containing an ovum or ova. (b) The inner layer of the fibrous wall of a Graafian follicle called?

ovisac — (a) A Graafian follicle; any sac containing an ovum or ova. (b) The inner layer of the fibrous wall of a Graafian follicle. (Webster's 1913.)

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