Definitions for: Chalaza


[n] one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell
[n] basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined



Webster (1913) Definition: Cha*la"za, n.; pl. E. Chalazas, L. Chalaz[ae].
[NL., fr. Gr. ? hail, pimple.]
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.

See Also: animal tissue, egg, ovule, plant part

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