| occlude |
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verb (occlud, ing)
- To obstruct, cover, or otherwise block an opening.
| | | occluded front |
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noun
- (Meteorology). An occluded front occurs when a cold front overtakes a warm front at the surface and a temperature contrast exists between the advancing and retreating cold air masses.
| | overcast |
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noun
- (obsolete) An outcast.
- A cloud covering all of the sky.
verb (overcast, ing)
- (context, transitive, obsolete) To overthrow.
- (transitive) To cover with cloud; to overshadow; to darken.
- (transitive) To make gloomy; to depress.
- (context, intransitive, obsolete) To be or become cloudy.
- (context, transitive, obsolete) To transform.
adjective
- Covered with clouds; overshadowed; darkened.
- (meteorology) The sky is said to be , when it is more than 90% covered by clouds.
- In a state of depression; gloomy; melancholy.
| | ozone layer |
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noun
- A region of the stratosphere, between 15 and 30 kilometres in altitude, containing a relatively high concentration of ozone; it absorbs most solar ultraviolet radiation
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