moiety
/ˈmɔɪətɪ/noun
(pl. -ies)
1- formal or technical each of two parts into which a thing is or can be divided〈正式或技〉部分（指一物两个组成部分之一）。
1.1
- Anthropology each of two social or ritual groups into which a people is divided, especially among Australian Aboriginals and some American Indians【人类学】（尤指澳大利亚土著和某些美国印第安人）半偶族, 半部族。
1.2
- a part or portion, especially a lesser share（尤指更小的）份额, 比例。
1.3
- Chemistry a distinct part of a large molecule【化】部分, 半个：
the enzyme removes the sulphate moiety.
该酶清除了硫酸盐构成的部分。
词源
late Middle English: from Old French moite, from Latin medietas 'middle'， from medius 'mid, middle'.