radius

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radius

(Carlyn Iverson)

n., pl., -di·i (-dē-ī'), or -di·us·es.

1. (Abbr. r or rad.) Mathematics.
   1. A line segment that joins the center of a circle with any point on its circumference.
   2. A line segment that joins the center of a sphere with any point on its surface.
   3. A line segment that joins the center of a regular polygon with any of its vertices.
   4. The length of any such line segment.
2. A circular area measured by a given radius: every family within a radius of 25 miles of the city center.
3. A bounded range of effective activity or influence: the operating radius of a helicopter.
4. A radial part or structure, such as a mechanically pivoted arm or the spoke of a wheel.
5. Anatomy.
   1. A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located on the lateral side of the ulna.
   2. A similar bone in many vertebrates.

[Latin, ray, spoke of a wheel, radius.]

1. A bone of the forearm. The radius is shorter than the ulna and, in the anatomical position, lies laterally on the thumb side.

2. A line extending front the centre to the circumference of a circle.

Pl. radii [L.]
1. a line radiating from a center, or a circular limit defined by a fixed distance from an established point or center.
2. one of the two long bones of the forearm that extends from the lateral side of the elbow to the medial side of the wrist or carpus.

• r. curvus syndrome — see curvus.

IN BRIEF: Any straight line that goes from the center to the outside of a circle or sphere. Also: The thicker of the two bones in the forearm.

Every radius of a circle measures exactly the same.

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

Dansk (Danish)
n. - radius, omkreds, område
v. tr. - afrunde

idioms:

• radius of action    område, radius, aktionsradius

Nederlands (Dutch)
straal, radius, spaak (been), krans (van samengestelde bloem), straal van zeester, afronden

Français (French)
n. - (Math) rayon, rayon (d'une distance), (Anat) radius
v. tr. - tracer un rayon

idioms:

• radius of action    rayon d'action

Deutsch (German)
n. - Radius, Halbmesser, Speiche, Strahl, Umkreis, (Anat.) Radius
v. - etwas eine runde Form geben

idioms:

• radius of action    Aktionsradius, Aktionsbereich

Ελληνική (Greek)
n. - (γεωμ., μτφ.) ακτίνα, (ανατ.) κερκίς

idioms:

• radius of action    ακτίνα δράσης

Italiano (Italian)
raggio

Português (Portuguese)
n. - rádio (m) (Anat.), raio (Mat., Geom.)

Русский (Russian)
радиус

Español (Spanish)
n. - radio
v. tr. - trazar el radio

idioms:

• radius of action    alcance, radio de acción

Svenska (Swedish)
n. - radie

中文（简体）(Chinese (Simplified))
半径, 辐射光线, 范围, 使...呈弧形

idioms:

• radius of action    行动范围, 有效距离

中文（繁體）(Chinese (Traditional))
n. - 半徑, 輻射光線, 範圍
v. tr. - 使...呈弧形

idioms:

• radius of action    行動範圍, 有效距離

한국어 (Korean)
n. - 반지름, 복사선, 요골
v. tr. - (모난 것을) 둥글리다

日本語 (Japanese)
n. - 半径, 範囲, 橈骨, 行動半径

idioms:

• radius of action    航続距離, 行動半径

العربيه (Arabic)
‏(الاسم) نصف القطر, عظم الكعبرة‏

עברית (Hebrew)
n. - ‮רדיוס, מחוג, עצם אמת-היד‬
v. tr. - ‮עיצב (קצה וכו') בצורה מעוגלת‬

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Atec Radius Pitching Machine	Lacoste Mens Radius
Lacoste Radius 2 Tone	Radius 2 Tone