noun
semiminor axis
Mathematical term for the shorter radius of an ellipse.
楕円の短半径は、中心から最も近い周上の点までの距離です。
The semiminor axis of an ellipse is the distance from the center to the nearest point on the circumference.
長半径 is the semimajor axis (longer radius), while 短半径 is the semiminor axis (shorter radius).
Compound of 短 (short) and 半径 (radius).