fellow

noun

1. 1

   a man who is the lover of a girl or young woman

   if I'd known he was her boyfriend I wouldn't have asked

2. 2

   a boy or man

   that chap is your host

   there's a fellow at the door

3. 3

   a person who is member of one's class or profession

   the surgeon consulted his colleagues

   he sent e-mail to his fellow hackers

4. 4

   a friend who is frequently in the company of another

   drinking companions

   comrades in arms

5. 5

   an informal form of address for a man

   Say, fellow, what are you doing?

   Hey buster, what's up?

6. 6

   a member of a learned society

   he was elected a fellow of the American Physiological Association

7. 7

   one of a pair

   he lost the mate to his shoe

   one eye was blue but its fellow was brown