Her*met"ic*al*ly, adv.

1.

In an hermetical manner; chemically.

Boyle.

2.

By fusion, so as to form an air-tight closure.

⇒ A vessel or tube is hermetically sealed when it is closed completely against the passage of air or other fluid by fusing the extremity; -- sometimes less properly applied to any air-tight closure.

 

© Webster 1913.

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