noun.
The brother of one's father or mother; also, the husband of one's aunt: correlative to aunt.
noun.
A familiar title of address to an old man.
noun.
A pawnbroker: so called in humorous allusion to the financial favors often expected and sometimes received from rich uncles.
noun.
A termination of some diminutive words of Latin origin, as homuncle (also homuncule), oratiuncle, etc.