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sibling

A sibling is your brother or sister. It's that simple.

The word sibling once meant anyone who is related to you, but now it's reserved for children of the same parent or parents. It is a word that was once out of use but then brought back into English in the early 1900s as a useful word in anthropology. If you and your brother fight all of the time, your parents might call it sibling rivalry. You might just call him annoying and run from the room.

Definitions of sibling
  1. noun
    a person's brother or sister
    synonyms: sib
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    types:
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    half blood
    one of siblings who have only one parent in common
    quad, quadruplet
    one of four children born at the same time from the same pregnancy
    quin, quint, quintuplet
    one of five children born at the same time from the same pregnancy
    triplet
    one of three offspring born at the same time from the same pregnancy
    twin
    either of two offspring born at the same time from the same pregnancy
    dizygotic twin, fraternal twin
    either of two twins who developed from two separate fertilized eggs
    identical twin, monozygotic twin, monozygous twin
    either of two twins developed from the same fertilized ovum (having the same genetic material)
    type of:
    relation, relative
    a person related by blood or marriage
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