(~s)
1.
The ~ of a telephone is the part that you speak into.
He shouted into the ~.
N-COUNT
2.
The ~ of a musical instrument or other device is the part that you put into your mouth.
He showed him how to blow into the ivory ~.
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3.
The ~ of an organization or person is someone who informs other people of the opinions and policies of that organization or person.
Their ~ is the vice-president...
N-COUNT: usu with poss