: in an airtight manner : so as to be completely airtight—usually used in the phrase hermetically sealed
They have their digitally alarmed, healthfully air-conditioned, hermetically sealed knotty-pine wine cellars … Alan RichmanDesigned for field use, the unit has a hermetically sealed touch keypad with six widely spaced keys suited for gloved operation. — Oil & Gas Journal… the entire manufacturing process takes place inside "clean rooms"—hermetically sealed factories where elaborate filtration systems keep the air a thousand times purer than in the best hospital operating rooms. Michael Rothschild(figurative) … creating a world so self-absorbed, so hermetically sealed, that its connection to public life is severed altogether … Ella Taylor(figurative) Control was always Jobs' approach to achieving excellence—Apple's beautiful, hermetically sealed ecosystem of products is the quintessence of control … Lev Grossman