Radius



GRE 考研

解释

GRE 红宝书

• n. 半径
• ［英］ n. 半径 ( a straight line going from the side of a circle to the center)
• ［类］ spoke : hub / radius : center ( 轮辐到轮轴距离相同 / 半径到圆心距离相同)

Webster Collegiate

noun (plural radii; also radiuses)

• Etymology: Latin, ray, radius
• Date: circa 1611
• 1. a line segment extending from the center of a circle or sphere to the circumference or bounding surface
• 2.
  • a. the bone on the thumb side of the human forearm; also a corresponding part of vertebrates above fishes
  • b. the third and usually largest vein of an insect's wing
• 3.
  • a. the length of a radius <a truck with a short turning radius>
  • b. the circular area defined by a stated radius
  • c. a bounded or circumscribed area
• 4. a radial part
• 5. the distance from a center line or point to an axis of rotation

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