An area of darkness formed on a surface when an object intercepts the light falling on the surface from a source. In the case of a point source the shadow has a sharply defined outline. If the source has an appreciable size the shadow has two distinct regions; one of full-shadow, called the umbra, the other of half-shadow, called the penumbra.
Shadows.
- stratified sample
- stratified sampling
- stratiform deposit
- stratiformis
- stratigraphic
- stratigraphic column
- stratigraphic correlation
- stratigraphic cross-section
- stratigraphic nomenclature
- stratigraphic reef
- stratigraphic scale
- stratigraphic trap
- stratigraphic unit
- stratigraphy
- stratocumulus
- stratomere
- Stratonician presumption
- Strato of Lampsacus (d. 269)
- stratopause
- stratophenetic classification
- stratophenetics
- stratosphere
- Stratospheric Aerosol and Gas Experiment
- Stratospheric Aerosol and Gas Experiment-III
- Stratospheric Observatory for Infrared Astronomy