径

(1)the length of a straight line passing through the center of a circle and connecting two points on the circumference

(2)円の中心点を通り、円周上の2点をつなぐ直線の長さ

(3)a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)

(4)円の中心と円周上の2点（または球の中心と球面上の2点）を結んでいる直線

(5)an open way (generally public) for travel or transportation

(6)旅行や輸送用の（一般的に公の）自由な道

(7)an established line of travel or access

(8)往来や出入りのために作られた進路