A man who is the eldest or senior member of a group.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "doyen" in a sentence
"The rules say the oldest MEP - or "doyen" - chairs the session until a new parliament president is elected."
"Medical readers will know that the Lancet - the other "doyen" of medical journalism in the UK, is no less rabid in its abuse of Israel."
"I also enjoyed your piece at 'Dark Trees about the "doyen"."