Manhole meaning

măn'hōl'
A hole, usually with a cover, through which a person may enter a sewer, boiler, drain, or similar structure.
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An opening, often with a cover, through which a person can enter a sewer, conduit, ship's tank, etc. for repair work or inspection.
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A hole in the ground used to access the sewers or other underground vaults and installations.
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Origin of manhole