ほじょたんい 補助単位 LinksSentence search for 補助単位Sentence search for ほじょたんいKanji details for 補, 助, 単 and 位Edit in JMdict Noun1. prefixed unit of measurement (i.e. millimeter, kilogram, etc.)Obsolete termNoun2. supplementary SI unit (radian and steradian)See also 組立単位 Discussions Log in to talk about this word.