Definition of steradian in English:
steradian
(also sr)
noun stəˈreɪdɪənstəˈreɪdiən
The SI unit of solid angle, equal to the angle at the centre of a sphere subtended by a part of the surface equal in area to the square of the radius.
Example sentencesExamples
- A sphere subtends 4 pi square radians (steradians) about the origin.
- The solid angle in question is only p / 4 steradian, one-sixteenth of the entire sky.
- This is the power of the light that is emitted per projected surface area into a given solid angle, and it is measured in watts per square metre per steradian.
- There are also two supplementary units, the radian, and the steradian.
Origin
Late 19th century: from Greek stereos 'solid' + radian.
Rhymes
Acadian, Akkadian, Arcadian, Barbadian, Canadian, circadian, Grenadian, Hadean, Orcadian, Palladian, radian
Definition of steradian in US English:
steradian
(also sr)
nounstəˈreɪdiənstəˈrādēən
The SI unit of solid angle, equal to the angle at the center of a sphere subtended by a part of the surface equal in area to the square of the radius.
Example sentencesExamples
- The solid angle in question is only p / 4 steradian, one-sixteenth of the entire sky.
- There are also two supplementary units, the radian, and the steradian.
- This is the power of the light that is emitted per projected surface area into a given solid angle, and it is measured in watts per square metre per steradian.
- A sphere subtends 4 pi square radians (steradians) about the origin.
Origin
Late 19th century: from Greek stereos ‘solid’ + radian.