a. A blood relation; a relative.
b. A person's relatives considered as a group; kinfolk.
2. A brother or sister; a sibling.
3. Anthropology A kinship group consisting of two or more lineages considered as being related, as by common descent from a mythic ancestor.
Related by blood; kindred.
[Middle English sibbe, from Old English sibb; see s(w)e- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.