English-Thai Dictionary

radius

N กระดูก แขน ท่อน ระหว่าง ข้อมือ กับ ข้อศอก  kra-duk-ton-kan-ra-wang-kor-mue

 

radius

N รัศมี  ความ ยาว จาก จุดศูนย์กลาง ถึง เส้นรอบวง ของ วงกลม  rad-sa-me

 

Webster's 1828 Dictionary

RADIUS

n.[L. id, a ray, a rod, a beam, a spoke, that is, a shoot; radio, to shine, that is, to dart beams. See Ray. ] 1. In geometry, a right line drawn or extending from the center of a circle to the periphery, and hence the semidiameter of the circle. In trigonometry, the radius is the whole sine, or sine of 9 degrees.
2. In anatomy, the exterior bone of the fore arm, descending along with the ulna from the elbow to the wrist.
3. In botany, a ray; the outer part or circumference of a compound radiate flower, or radiated discous flower.

 

Webster's 1913 Dictionary

RADIUS

Ra "di *us, n.; pl. L. Radii; E. Radiuses. Etym: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line. ]

 

1. (Geom.)

 

Defn: A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

 

2. (Anat. )

 

Defn: The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.

 

Note: The radius is on the same side of the limb as the thumb, or pollex, and in man it so articulated that its lower end is capable of partial rotation about the ulna.

 

3. (Bot. )

 

Defn: A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.

 

4. pl. (Zoöl.) (a ) The barbs of a perfect. (b ) Radiating organs, or color-markings, of the radiates.

 

5. The movable limb of a sextant or other angular instrument. Knight. Radius bar (Math. ), a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc. -- Radius of curvature. See under Curvature.

 

RADIUS VECTOR

RADIUS VECTOR Ra "di *us vec "tor.

 

1. (Math. )

 

Defn: A straight line (or the length of such line ) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coördinates. See Coördinate,n.

 

2. (Astron.)

 

Defn: An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.

 

New American Oxford Dictionary

radius

ra di us |ˈrādēəs ˈreɪdiəs | ▶noun ( pl. radii |ˈrādēˌī | or radiuses ) 1 a straight line from the center to the circumference of a circle or sphere. See also illustration at geometric. • a radial line from the focus to any point of a curve. • the length of the radius of a circle or sphere. • a specified distance from a center in all directions: there are plenty of local pubs within a two-mile radius. 2 Anatomy the thicker and shorter of the two bones in the human forearm. Compare with ulna. • Zoology the corresponding bone in a vertebrate's foreleg or a bird's wing. • Zoology (in an echinoderm or coelenterate ) any of the primary axes of radial symmetry. • Entomology any of the main veins in an insect's wing. ORIGIN late 16th cent. ( sense 2 ): from Latin, literally ‘staff, spoke, ray. ’

 

radius of curvature

ra di us of cur va ture ▶noun Mathematics the radius of a circle that touches a curve at a given point and has the same tangent and curvature at that point.

 

radius vector

ra di us vec tor ▶noun Mathematics a line of variable length drawn from a fixed origin to a curve. • Astronomy such a line joining a satellite or other celestial object to its primary.

 

Oxford Dictionary

radius

radius |ˈreɪdɪəs | ▶noun ( pl. radii |-dɪʌɪ | or radiuses ) 1 a straight line from the centre to the circumference of a circle or sphere. • a radial line from the focus to any point of a curve. • a specified distance from a centre in all directions: there are plenty of local pubs within a two-mile radius. 2 Anatomy the thicker and shorter of the two bones in the human forearm. Compare with ulna. • Zoology the bone in a vertebrate's foreleg or a bird's wing that corresponds to the radius in a human being. • Entomology any of the main veins in an insect's wing. 3 Zoology a radially symmetric feature in an echinoderm or coelenterate, e.g. an arm of a starfish. ▶verb ( radiuses, radiusing, radiused ) [ with obj. ] (often as adj. radiused ) give a rounded form to (a corner or edge ). ORIGIN late 16th cent. (in sense 2 of the noun ): from Latin, literally ‘staff, spoke, ray ’.

 

radius of curvature

ra ¦dius of curva |ture ▶noun Mathematics the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.

 

radius vector

ra ¦dius vec ¦tor ▶noun Mathematics a line of variable length drawn from a fixed origin to a curve. • Astronomy a line of variable length joining a satellite or other celestial object to its primary.

 

Duden Dictionary

Radius

Ra di us Substantiv, maskulin , der |R a dius |der Radius; Genitiv: des Radius, Plural: die Radien lateinisch radius = Stab; Speiche; Strahl 1 Mathematik halber Durchmesser eines Kreises oder einer Kugel; Halbmesser Abkürzung: R Abkürzung: r den Radius eines Kreises berechnen 2 Kurzwort für: Aktionsradius 1

 

French Dictionary

radius

radius n. m. nom masculin Os de l ’avant-bras. : Le radius et le cubitus. Prononciation Le s se prononce, [radjys ]; le nom rime avec cactus

 

Sanseido Wisdom Dictionary

radius

ra di us /réɪdiəs /名詞 C 1 半径 ▸ a circle with a radius of 300 meters 半径300メートルの円 2 〖通例距離を示す 名詞 の後で 〗(ある地点から全方向への 活動 [興味 ]などの )範囲, 圏, 分野 ▸ within a hundred (-)mile radius of the campus 大学構内の半径100マイル圏内に 3 〘解剖 〙橈 （とう ）骨 .4 (円心から円周へ引いた )放射状線 .