軌き道どう短たん半はん径けいMeaningsNoun1. semi-minor axis (esp. in orbital matters)Kanji used軌tracks道roadway短short半half径diameterComposed of軌き道どうorbit; trajectory; (railroad) track; (right) track; proper courseNoun短たんfault; defect; weak point; minor; 5-point card; shortNoun半はん径けいradiusNoun