SIB


Meaning of SIB in English

■ noun

1》 chiefly Zoology a brother or sister; a ~ling.

2》 Anthropology a group of people recognized by an individual as his or her kindred.

Origin

OE 'relative' and 'related by birth or descent', of unknown origin.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.