(space science) A suborbital rocket used to launch upper atmosphere, exoatmospheric, and microgravity sondes or probes.

An acoustic mirror.

plural of sound mirror

(UK, informal) wholesome; reliable; in good condition

(sound, headphones) the property of blocking off outside sound through use of materials that reduce sound transmission from the exterior environment into the interior environment

Perfectly sound.

plural of sound post

(photography) A housing attached to a camera in order to reduce the shutter click sound.

present participle of sound out

Third-person singular simple present indicative form of sound out