manhole definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an opening, often with a cover, through which a person can enter a sewer, conduit, ship's tank, etc. for repair work or inspection
manhole definition by American Heritage Dictionary
A hole, usually with a cover, through which a person may enter a sewer, boiler, drain, or similar structure.