Word Origin & History
loudO.E. hlud "making noise, sonorous," from W.Gmc. *khluthaz "heard" (cf. O.Fris. hlud, M.Du. luut, Du. luid, O.H.G. hlut, Ger. laut "loud"), from PIE pp. *klutos- (cf. Skt. srutah, Gk. klytos "heard of, celebrated," Arm. lu "known," Welsh clod "praise"), from base *kleu- "to hear" (see
listen). The adv. is from O.E. hlude, from P.Gmc. *khludai. Application to colors first recorded 1849. Loudmouth (n.) first recorded 1934. Loudspeaker is from 1884.