radius

[ rey-dee-uhs ]

/ ˈreɪ di əs /

SEE SYNONYMS FOR radius ON THESAURUS.COM

noun, plural ra·di·i [rey-dee-ahy], /ˈreɪ diˌaɪ/, ra·di·us·es.

a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter.

the length of such a line.

any radial or radiating part.

a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.

a field or range of operation or influence.

extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane.

Anatomy. the bone of the forearm on the thumb side.Compare ulna (def. 1).

Zoology. a corresponding bone in the forelimb of other vertebrates.

Machinery Now Rare. the throw of an eccentric wheel or cam.

a rounded corner or edge on a machined or cast piece of metal.

Entomology. one of the principal longitudinal veins in the anterior portion of the wing of an insect.

Origin of radius

1590–1600; <Latin: staff, rod, spoke, beam, originally, ray¹

WORDS THAT MAY BE CONFUSED WITH radius

circumference, diameter, radius , tangent

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for radius

radius

/ (ˈreɪdɪəs) /

noun plural -dii (-dɪˌaɪ) or -diuses

a straight line joining the centre of a circle or sphere to any point on the circumference or surface

the length of this line, usually denoted by the symbol r

the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius)

anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist

a corresponding bone in other vertebrates

any of the veins of an insect's wing

a group of ray florets, occurring in such plants as the daisy

any radial or radiating part, such as a spoke
(as modifier)a radius arm

the lateral displacement of a cam or eccentric wheel

a circular area of a size indicated by the length of its radiusthe police stopped every lorry within a radius of four miles

the operational limit of a ship, aircraft, etc

Word Origin for radius

C16: from Latin: rod, ray, spoke

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for radius

radius

[ rā′dē-əs ]

n. pl. ra•di•us•es

A line segment that joins the center of a circle with any point on its circumference.

A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located laterally to the ulna.

Scientific definitions for radius

radius

[ rā′dē-əs ]

Plural radii (rā′dē-ī′) radiuses

A line segment that joins the center of a circle or sphere with any point on the circumference of the circle or the surface of the sphere. It is half the length of the diameter.

The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg. See more at skeleton.

单词	radius
释义	radius [ rey-dee-uhs ] / ˈreɪ di əs / SEE SYNONYMS FOR radius ON THESAURUS.COM noun, plural ra·di·i [rey-dee-ahy], /ˈreɪ diˌaɪ/, ra·di·us·es. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line. any radial or radiating part. a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles. a field or range of operation or influence. extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane. Anatomy. the bone of the forearm on the thumb side.Compare ulna (def. 1). Zoology. a corresponding bone in the forelimb of other vertebrates. Machinery Now Rare. the throw of an eccentric wheel or cam. a rounded corner or edge on a machined or cast piece of metal. Entomology. one of the principal longitudinal veins in the anterior portion of the wing of an insect. Origin of radius 1590–1600; <Latin: staff, rod, spoke, beam, originally, ray¹ WORDS THAT MAY BE CONFUSED WITH radius circumference, diameter, radius , tangent Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for radius radius / (ˈreɪdɪəs) / noun plural -dii (-dɪˌaɪ) or -diuses a straight line joining the centre of a circle or sphere to any point on the circumference or surface the length of this line, usually denoted by the symbol r the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius) anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist a corresponding bone in other vertebrates any of the veins of an insect's wing a group of ray florets, occurring in such plants as the daisy any radial or radiating part, such as a spoke (as modifier)a radius arm the lateral displacement of a cam or eccentric wheel a circular area of a size indicated by the length of its radiusthe police stopped every lorry within a radius of four miles the operational limit of a ship, aircraft, etc Word Origin for radius C16: from Latin: rod, ray, spoke Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Words related to radius purview, ambit, span, extension, space, interval, reach, orbit, expanse, limit, extent, compass, boundary, spoke, semidiameter Medical definitions for radius radius [ rā′dē-əs ] n. pl. ra•di•us•es A line segment that joins the center of a circle with any point on its circumference. A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located laterally to the ulna. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for radius radius [ rā′dē-əs ] Plural radii (rā′dē-ī′) radiuses A line segment that joins the center of a circle or sphere with any point on the circumference of the circle or the surface of the sphere. It is half the length of the diameter. The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg. See more at skeleton. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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radius

noun, plural ra·di·i [rey-dee-ahy], /ˈreɪ diˌaɪ/, ra·di·us·es.

Origin of radius

WORDS THAT MAY BE CONFUSED WITH radius

British Dictionary definitions for radius

noun plural -dii (-dɪˌaɪ) or -diuses

Word Origin for radius

Words related to radius

Medical definitions for radius

n. pl. ra•di•us•es

Scientific definitions for radius

Plural radii (rā′dē-ī′) radiuses