n. (pl. -zae , -zas) 1.【植物；植物学】合点。 2.【动物；动物学】卵(黄系)带，(昆虫的)毛突。 adj. -l
one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell
basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined
The chalaza (; from Greek "hailstone"; plural chalazas or chalazae) is a structure inside bird and reptile eggs and plant ovules. It attaches or suspends the yolk or nucellus within the larger structure.
例句与用法
1.
Chalaza ( pl . chalaxae or chalazas ) the region of an angiosperm ovule where the nucellus and integuments merge 合点：被子植物胚珠上的一个区域，在合点处珠心和珠被愈合。
2.
When ovule orientation is orthotropous the chalaza corresponds to the point where the funicle is attached but in anatropous and campylotropous ovules the chalaza is some distance from the funicle 当胚珠的方向是直生胚珠时，合点和珠柄连成一条直线，当胚珠是倒生胚珠或弯生胚珠时，合点和珠柄之间有一定的距离。
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