(亦作o)
(pl. Os 或O's)
1
- the fifteenth letter of the alphabet英语字母表中第十五个字母。
1.1
- denoting the next after N in a set of items, categories, etc.O项, O类（一组项目、分类中的第十五位）。
1.2
- a human blood type (in the ABO system) lacking both the A and B antigens. In blood transfusion, a person with blood of this group is a potential universal donor.O型血。
2
- （亦作oh）nought or zero (in a sequence of numerals, especially when spoken)尤用于口语一连串数字中零。
3
- a shape like that of a capital O; a circle.O字形; 圆圈。
- the chemical element oxygen（化学元素）氧。
1
- archaic spelling of
OH1 .〈古〉同OH1 .
2
- archaic used before a name in the vocative〈古〉［用于称呼语前］啊：
give peace in our time, O Lord.
啊, 上帝, 请给我们的时代以和平。
词源
natural exclamation: first recorded in Middle English.