半はん長ちょう径けい

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Meanings

1

noun

geometry

Technical term in geometry; refers to half of the longest diameter of an ellipse.

長ちょう半はん径けい
Synonym for semi-major axis; 半長径 and 長半径 are used interchangeably in geometry.
半はん短たん径けい
Semi-minor axis; the shorter half-diameter of an ellipse, contrasting with 半長径.

Compound of 半 (half) + 長 (long) + 径 (diameter), directly translating the concept of 'semi-major axis'.