1. sealed so that air cannot enter or escape; airtight
2. difficult to understand; obscure or mysterious in meaning
Usage: often used to describe abstract or esoteric writing or philosophy

Examples

• The hermetical seal on the container kept the medicine fresh for years.
• The ancient text was written in a hermetical style that only scholars could decipher.
• A hermetical closure prevents any air leakage from the bottle.
• His hermetical prose made the philosophical argument nearly impossible to follow.
• The laboratory required hermetical conditions to protect the sensitive experiment.
• The poet's hermetical language challenged readers to find deeper meaning in every line.