An Etymological Dictionary of Astronomy and Astrophysics

High in volume of sound.

Etymology (EN): M.E., O.E. hlud “making noise, sonorous” (cf. M.Du. luut, Du. luid, O.H.G. hlut, Ger. laut “loud”),
from PIE *klutos- (cf. Skt. sruta-, Gk. klytos “heard of, celebrated,” Arm. lu “known.”

Etymology (PE): Boland, → high.