A fraternal twin.
A society formed to provide mutual aid, such as insurance.
Of or pertaining to a fraternity.
Of or pertaining to a brother or brothers.
Platonic or friendly.
Of twins or embryos, produced from two different eggs and sperm, and genetically distinct.
A person who shares a parent; one's brother or sister who one shares a parent with.
A node in a data structure that shares its parent with another node.
The most closely related species, or one of several most closely related species when none can be determined to be more closely related.