subsonic.

Moving below the speed of sound in the relevant medium.

Use it for

Words that belong together

• subsonic flight
• subsonic flow

On the page

The transport remained subsonic.

The intake slowed the flow to subsonic speed.

Usage notes

Primary category: sci-fi. Forms: Normally non-gradable as a technical classification. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.