FromProto-Mon-Khmer*luŋ(h) ~ *luuŋ(h) ~ *ləŋ(h)(“hole, hollow; to bore, excavate”); cognate withKhmerលុង(lung,“to dig hole, drill, bore, excavate”),Central Nicobareseong-lòng(“to drill hole”).
trũng• (𫢵,𬺙,冢)