sib
/sɪb/noun
1
- chiefly Zoology a brother or sister; a sibling【主动】胞亲; 兄弟; 姊妹; 同胞。
2
- Anthropology a group of people recognized by an individual as his or her kindred【人类学】（血统）氏族, 亲族, 血亲亲属。
词源
Old English 'related by birth or descent'， of unknown origin. Sense 1 dates from the early 20th cent.