plural of sounding rocket

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

present participle of sound out

plural of sounding stone

A Chinese musical instrument, usually L-shaped, made of stone or jade, hung and struck as a xylophone.

plural of sounding balloon

plural of sounding rod

plural of echo sounding

(nautical) A weighted line with distances marked off at regular intervals, used to measure the depth of water under a boat.

(music, acoustics, physics) sounding together