1. completely sealed so that no air can get in or out; airtight
2. protected from outside influences; isolated or insulated
3. relating to ancient occult traditions, especially alchemy
Usage: specialized

Examples

• The laboratory samples were stored in hermetic containers to prevent contamination.
• The spacecraft required a hermetic seal to maintain cabin pressure.
• The wealthy family lived in a hermetic world, isolated from ordinary society.
• The hermetic community rarely interacted with outsiders.
• Ancient hermetic texts contained mysterious symbols and formulas.
• The hermetic traditions influenced early scientific thinking.
• Food packaging uses hermetic sealing to preserve freshness.