Mining. a crossing of two passages, as airways, dug at the same level so that one descends to pass beneath the other without any opening into it.Compare overcast.
Meteorology. an overcast layer of clouds viewed from above.
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Undercast, un′dėr-kast, n. an air-passage crossing a road in a mine by means of an air-tight box or channel beneath it.
By noon the sky was heavily overcast, and an hour later undercast as well.