Chalaza, n. [NL., fr. Gr. hail, pimple.].
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The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus. [1913 Webster]
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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]