Ovisac

noun

1. An egg-containing capsule, such as an ootheca or a Graafian follicle.
2. A sac, cyst, or cell containing an ovum or ova; an ovicell, ovicyst, or ovicapsule: variously applied.
3. A Graafian follicle; any sac containing an ovum or ova.
4. The inner layer of the fibrous wall of a Graafian follicle.
5. A Graafian follicle; any sac containing an ovum or ova.