Overcast

Science / Weather / Overcast: The amount of sky cover for a cloud layer that is 8/8ths, based on the summation layer amount for that layer.
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Other Words for Overcast

Overcast Verb Synonyms: cloudy, clouded, sunless, moonless, starless, murky, grey, louring or lowering, dull, dark, darkened, dreary, sombre, gloomy, dismal, threatening, menacing
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Undercast

Science / Weather / Undercast: In aviation, it is an opaque cloud layer viewed from an observation point above the layer. From the ground, it would be considered an overcast. MORE

Diffuse Lighting

Entertainment / Photography / Diffuse Lighting: Lighting that is low or moderate in contrast, such as on an overcast day. MORE

Ceiling

Business / Accounting / Ceiling: The maximum market amount at which inventory can be carried on the books: equal to net realizable value. MORE