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Radius :: Radius (n.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

Sine :: Sine (n.) The length of a perpendicular drawn from one extremity of an arc of a circle to the diameter drawn through the other extremity.

Systyle :: Systyle (a.) Having a space equal to two diameters or four modules between two columns; -- said of a portico or building. See Intercolumniation.

Heliometer :: Heliometer (n.) An instrument devised originally for measuring the diameter of the sun; now employed for delicate measurements of the distance and relative direction of two stars too far apart to be easily measured in the field of view of an ordinary telescope.

Diameter :: Diameter (n.) A diametral plane.

Diametrical :: Diametrical (a.) Of or pertaining to a diameter.

Howitzer :: Howitzer (n.) A short, light, largebore cannon, usually having a chamber of smaller diameter than the rest of the bore, and intended to throw large projectiles with comparatively small charges..

Dendrometer :: Dendrometer (n.) An instrument to measure the height and diameter of trees.

Adansonia :: Adansonia (n.) A genus of great trees related to the Bombax. There are two species, A. digitata, the baobab or monkey-bread of Africa and India, and A. Gregorii, the sour gourd or cream-of-tartar tree of Australia. Both have a trunk of moderate height, but of enormous diameter, and a wide-spreading head. The fruit is oblong, and filled with pleasantly acid pulp. The wood is very soft, and the bark is used by the natives for making ropes and cloth..

Volvox :: Volvox (n.) A genus of minute, pale-green, globular, organisms, about one fiftieth of an inch in diameter, found rolling through water, the motion being produced by minute colorless cilia. It has been considered as belonging to the flagellate Infusoria, but is now referred to the vegetable kingdom, and each globule is considered a colony of many individuals. The commonest species is Volvox globator, often called globe animalcule..

Jupiter :: "Jupiter (n.) One of the planets, being the brightest except Venus, and the largest of them all, its mean diameter being about 85,000 miles. It revolves about the sun in 4,332.6 days, at a mean distance of 5.2028 from the sun, the earth's mean distance being taken as unity..

Module :: Module (n.) The size of some one part, as the diameter of semi-diameter of the base of a shaft, taken as a unit of measure by which the proportions of the other parts of the composition are regulated. Generally, for columns, the semi-diameter is taken, and divided into a certain number of parts, called minutes (see Minute), though often the diameter is taken, and any dimension is said to be so many modules and minutes in height, breadth, or projection..

Parameter :: Parameter (n.) Specifically (Conic Sections), in the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate..

Opposite :: Opposite (a.) Set over against each other, but separated by the whole diameter of the stem, as two leaves at the same node..

Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

Equirotal :: Equirotal (a.) Having wheels of the same size or diameter; having equal rotation.

Calibre :: Calibre (n.) The diameter of round or cylindrical body, as of a bullet or column..

Diametral :: Diametral (a.) Pertaining to a diameter; diametrical.

Breadfruit :: Breadfruit (n.) The fruit of a tree (Artocarpus incisa) found in the islands of the Pacific, esp. the South Sea islands. It is of a roundish form, from four to six or seven inches in diameter, and, when baked, somewhat resembles bread, and is eaten as food, whence the name..

Bore :: Bore (n.) The size of a hole; the interior diameter of a tube or gun barrel; the caliber.

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