airtight.

1. Sealed so that air cannot pass through under the conditions being described.

2. So well supported or logically secure that no evident weakness can be found.

Use it for

Words that belong together

• an airtight seal
• an airtight compartment

On the page

An airtight seal separated the compartment from the rest of the vessel.

She checked the airtight container before moving the fragile samples.

Usage notes

Primary category: setting. Forms: Relational or positional adjective; ordinary comparative and superlative usually not applicable. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.