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.
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