cha·la·za /kəˈlezə, ˈlæ-/
cha·la·za /kəˈlezə, ˈlæzə/ 名詞
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.
n 1: basal part of a plant ovule opposite the micropyle; where
integument and nucellus are joined
2: one of two spiral bands of tissue connecting the egg yolk to
the enclosing membrane at either end of the shell
[also: chalazae (pl)]