radian

名词 n.
中文释义

英文释义

名词 n.
  1. In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.

词形变化

radians plural

词源

Etymology tree
Latin radiusbor.
English radius
Proto-Indo-European *-nós
Proto-Italic *-nos
Latin -nus
Latin -ānus
Old French -ainder.
Middle English -an
English -an
English radian
From radius + -an.
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