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After blowing up a balloon, in order to prevent the air coming out you have to tie its open-end as shown in the picture.

Do we call the tiny part running from the knot to the open-end of the balloon "the stem of the balloon", e.g., "hold the balloon by its stem"?

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Balloons are said to have necks:

Whether or not it has a knot in it.

Neck The neck of a round balloon is the portion which connects its body to its inflation outlet. It is also the portion of a balloon which is tied into a knot to keep it inflated.

Anatomy of a balloon

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