chalaza

‖n.; pl. E. Chalazas, L. Chalazæ [ NL., fr. Gr. &unr_; hail, pimple. ] 1. (Bot.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus. [ 1913 Webster ]

2. (Biol.) A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle. [ 1913 Webster ]