半径 は英語でradius 英語の定義 半径 1. n. (geometry) radius その他の翻訳と定義 radius 1. 名詞. (解剖学)橈骨。 2. 名詞. (geometry) 半径。 radius 1. n. (anatomy) The long bone in the forearm, on the side of the thumb. 2. n. (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal. 3. n. (entomology) One of the major veins of the insect wing, between the subcosta and the media 4. n. (geometry) A line segment between any point of a circle or sphere and its center. 5. n. (geometry) The length of this line segment. ウィクショナリーから辞書引用辞書