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Definition of sib noun from the Oxford Advanced Learner's Dictionary

sib

noun

/sɪb/

/sɪb/

(biology)

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a brother or sister
Word OriginOld English ‘related by birth or descent’, of unknown origin. Modern senses date from the late 19th and early 20th cents.

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See sib in the Oxford Advanced American Dictionary

Check pronunciation: sib

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preposition

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