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manhole
CIDE DICTIONARY
manhole, 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. [1913 Webster]
OXFORD DICTIONARY
manhole, n. a covered opening in a floor, pavement, sewer, etc. for workmen to gain access.
THESAURUS
manhole
air hole, armhole, blowhole, bullet-hole, bunghole, cringle, deadeye, eye, eyelet, gasket, grommet, guide, keyhole, knothole, loop, loophole, mousehole, peephole, pigeonhole, pinhole, placket, placket hole, porthole, punch-hole, spiracle, tap, vent, ventholeFor further exploring for "manhole" in Webster Dictionary Online