‖Cha‐la″za (?), n.; pl. E. Chalazas, L. Chalazæ (#). 1. (Bot.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus.
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.