One of two or more individuals having one or both parents in common; a brother or sister.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sibling" in a sentence
"Fighting, Fighting, and More Fighting:Does the word sibling have to be synonymous with the word fight?"
"Stand to Reason uses the term sibling rivalry to describe conflicting arguments used by the same party."
"MM there the probability that if you are a male, your sibling is a female is 2/3"