1. 合点：珠被、珠心基部与珠柄汇合的部位称为合点(chalaza),是珠柄维管束进入胚囊的位置. 珠柄、珠孔与合点三者排列位置的变化形成了几种常见的胚珠类型,其中以倒生胚珠在被子植物中最为常见. 胚珠类型有时亦可作为分类鉴定的依据.
2. 系带：chaitya 寺庙 | chalaza 系带 | chalcedonic 石髓的
3. 合点;卵带;毛突：chain termination codon 链终止密码子 | chalaza 合点;卵带;毛突 | chalazogamy 合点受精
4. 被膜合点;蛋白带：被盖构造 decken structure | 被膜合点;蛋白带 chalaza | 被囊类 Tunicata
noun
1. one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell
2. basal part of a plant ovule opposite the micropyle
where integument and nucellus are joined