1. (noun) a male with the same parents as someone else

• brother

1. (noun) a male with the same parents as someone else

• male sibling

2. (noun) a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother

• ally
• friend

1. (noun) a male with the same parents as someone else

• big brother
• half brother
• half-brother
• stepbrother
• little brother

1. (noun) a male with the same parents as someone else

• brotherlike
• brotherly
• fraternal

1. (noun) a male with the same parents as someone else

• sis
• sister