steradian
/stəˈreɪdɪən
/(abbreviation sr)
noun
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.A sphere subtends 4 pi square radians (steradians) about the origin....
- 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.
Origin
Late 19th century: from Greek stereos 'solid' + radian.
Rhymes
- resolving time
- resonance
- resonance absorption
- resonance capture
- resonance cavity
- resonance chamber
- resonance energy
- resonance fluorescence
- resonance frequency
- resonance hybrid
- resonance level
- resonance radiation
- resonance Raman
- resonance scattering
- resonance stabilization
- resonancy
- resonant
- resonant cavity
- resonant frequency
- resonantly
- resonant scattering
- resonate
- resonation
- resonator
- resonatory