補ほ助じょ単たん位い

noun

prefixed unit of measurement

Obsolete term for a unit formed by adding a prefix to a base unit, such as millimeter or kilogram. In modern Japanese, 接頭語付き単位 or simply 単位 with the prefix is more common.

• 古ふるい教きょう科か書しょでは、ミリメートルやキログラムを「補ほ助じょ単たん位い」と呼よんでいた。

  Old textbooks called millimeters and kilograms 'prefixed units of measurement'.

noun

supplementary SI unit

Specifically refers to the radian and steradian in the International System of Units. This usage is technical and may be encountered in older metrology contexts; modern Japanese often uses 補助計量単位 or simply ラジアン and ステラジアン.

See also: 組立単位

• ラジアンとステラジアンは、かつてSIの補ほ助じょ単たん位いに分ぶん類るいされていた。

  The radian and steradian were once classified as supplementary SI units.