Definition of "Sounding" :

noun: the act of measuring depth of water (usually with a sounding line)

noun: a measure of the depth of water taken with a sounding line

adjective: making or having a sound as specified; used as a combining form

"Harsh-sounding."

adjective: having volume or deepness

"Sounding brass and a tinkling cymbal."

adjective: appearing to be as specified; usually used as combining forms

"Fine-sounding phrases."