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Definitions for Radii

[1] a plural of radius.
[2] 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.
[3] the length of such a line.
[4] any radial or radiating part.
[5] 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.
[6] a field or range of operation or influence.
[7] extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane.
[8] Anatomy . the bone of the forearm on the thumb side. Compare ulna(def 1) .
[9] Zoology . a corresponding bone in the forelimb of other vertebrates.
[10] Machinery Now Rare . the throw of an eccentric wheel or cam.
[11] a rounded corner or edge on a machined or cast piece of metal.
[12] Entomology . one of the principal longitudinal veins in the anterior portion of the wing of an insect.
[13] a plural of radius
[14] a straight line joining the centre of a circle or sphere to any point on the circumference or surface
[15] the length of this line, usually denoted by the symbol r
[16] the distance from the centre of a regular polygon to a vertex (long radius ) or the perpendicular distance to a side (short radius )
[17] anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist
[18] a corresponding bone in other vertebrates
[19] any of the veins of an insect's wing
[20] a group of ray florets, occurring in such plants as the daisy
[21] any radial or radiating part, such as a spoke (as modifier ) a radius arm
[22] the lateral displacement of a cam or eccentric wheel
[23] a circular area of a size indicated by the length of its radius the police stopped every lorry within a radius of four miles
[24] the operational limit of a ship, aircraft, etc

Words related to Radii

purview, ambit, span, extension, space, interval, reach, orbit, expanse, limit, extent, compass, boundary, spoke, semidiameter

Words nearby Radii

radiculomyelopathy, radiculoneuropathy, radiculopathy, radiectomy, radiguet, radii, radin, radio, radio astronomy, radio beacon, radio beam

Origin of Radii

us1590–1600; < Latin: staff, rod, spoke, beam, orig., ray1

Words that may be confused with Radii

WORDS, THAT, MAY, BE, CONFUSED, WITH, radiuscircumference, diameter, radius, tangent

Word origin for Radii

usC16: from Latin: rod, ray, spoke

Synonyms for Radii

ambit, boundary, compass, expanse, extension, extent, interval, limit, orbit, purview, reach, semidiameter, space, span, spoke