Someone who is a friend of two or more people, each of whom may not know each other.

A long-standing friend / A friend who is old / aged

plural of old friend

Alternative form of friend of Bill W.

Alternative form of friend of Bill W.

plural of Public Friend

A Quaker authorized to travel between meetings and communities to preach; a Quaker preacher (in the 17- and 1800s).

Alternative letter-case form of public Friend

plural of public Friend

(historical) An American Quaker (Christian) sect (from the 1770s to 1860s), the "Society of Universal Friends", which followed the teachings of the Public Universal Friend.