a person which attends the bridegroom at a wedding.
certainly one of many attendants to a bridegroom at a marriage, among who is the best guy.
A male attendant of a bridegroom at their marriage; -- the principle attendant can also be known as the most effective guy; -- the correlative of bridesmaid.
one that will act as attendant on a bridegroom at his wedding.
How would you define groomsman?