(via https://www.etymonline.com/word/Sound )
| sound | “noise, what is heard, sensation produced through the ear” | late 13c., soun, from Old French son “sound, musical note, voice,” from Latin sonus “sound, a noise,” from PIE *swon-o-, from root *swen- “to sound.” |
| sound | “to be audible, produce vibrations affecting the ear” | from Old French soner (Modern French sonner) and directly from Latin sonare “to sound, make a noise” (from PIE root *swen- “to sound”). It is attested from late 14c. as “cause something (an instrument, etc.) to produce sound.” |
| sound | “healthy, not diseased, free from special defect or injury” | c. 1200, sounde, from Old English gesund “sound, safe, having the organs and faculties complete and in perfect action,” from Proto-Germanic *sunda-, from Germanic root *swen-to- “healthy, strong” (source also of Old Saxon gisund, Old Frisian sund, Dutch gezond, Old High German gisunt, German gesund “healthy,” as in the post-sneezing interjection gesundheit; also Old English swið “strong,” Gothic swinþs “strong,” German geschwind “fast, quick”). The German words have connections in Indo-Iranian and Balto-Slavic. |
| sound | “fathom, probe, measure the depth of water” | mid-14c. (implied in sounding), from Old French sonder, from sonde “sounding line,” perhaps from the same Germanic source that yielded Old English sund “water, sea” |
| sound | “narrow channel of water” | c. 1300, sounde, from Old Norse sund “a strait, swimming,” or from cognate Old English sund “act of swimming; stretch of water one can swim across, a strait of the sea,” both from Proto-Germanic *sundam-, from asuffixed form of Germanic *swem- “to move, stir, swim” |