I. soun·der ˈsau̇ndə(r) noun
( -s )
Etymology: Middle English, from Middle French sondre, sonre, of Germanic origin; akin to Old English sunor herd of swine, Old Norse sonar- herd of swine, Middle High German swaner herd
: a herd of wild swine
II. sound·er noun
( -s )
Etymology: sound (VI) + -er
: one that sounds: as
a. : a man who measures depths of water with a lead : leadsman
b. : a device for making soundings — see depth-sounder
III. sounder noun
( -s )
Etymology: sound (IV) + -er
: an electromagnetic instrument used in telegraphy that emits clicking sounds from which a message is interpreted