This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A hole, usually with a cover, through which a person may enter a sewer, boiler, drain, or similar structure.

n. A hole in the ground used to access the sewers or other underground vaults and installations.

n. A hole through which a man may descend or creep into a drain, sewer, steam boiler, parts of machinery, etc., for cleaning or repairing.

n. A hole through which a man may enter a sewer, drain, cesspool, or the like, for cleaning or repairing; in steam-boilers, hot-water tanks, keirs, etc., a hole formed in the shell, through which a man may enter to the interior for cleaning, inspection, or repairs.

n. In coal-mining: An excavation or refuge-hole made in the side of an underground engine-plane or horse-road. [Eng.] A small and generally short passage used for the ingress and egress of the miners. [Pennsylvania anthracite, region.] A niche cut in the side of a railroad-tunnel as a refuge-hole.

To enter or use a manhole, as for the purpose of examining or repairing machinery.

n. a hole (usually with a flush cover) through which a person can gain access to an underground structure

"Smoke machines and loudspeakers, carefully hidden in manhole covers throughout Manhattan, completed the breathtakingly convincing display."

hole   

manhole cover   

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