Hermetically
Pronunciation : Her*met"ic*al*ly
Part of Speech : adv.
Definition : 1. In an hermetical manner; chemically. Boyle.
2. By fusion, so as to form an air-tight closure.
Note: 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.
Source : Webster's Unabridged Dictionary, 1913