Vietnamese Etymology Sino-Vietnamese word from 係數, from Japanese 係数 (keisū). Pronunciation (Hà Nội) IPA(key): [he˧˨ʔ so˧˦] (Huế) IPA(key): [hej˨˩ʔ ʂow˨˩˦] ~ [hej˨˩ʔ sow˨˩˦] (Saigon) IPA(key): [hej˨˩˨ ʂow˦˥] ~ [hej˨˩˨ sow˦˥] Audio (Hà Nội):(file) Noun hệ số (algebra) a coefficient See also thừa số hằng số Wikiwand - on Seamless Wikipedia browsing. On steroids.