'opener' definitions:

Definition of 'opener'

From: WordNet
noun
The first event in a series; "she played Chopin for her opener"; "the season's opener was a game against the Yankees"
noun
A person who unfastens or unwraps or opens; "children are talented undoers of their shoelaces" [syn: undoer, opener, unfastener, untier]
noun
A hand tool used for opening sealed containers (bottles or cans)