manhole

noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about manhole at Wordnik → Where our words come from →

1. A hole in the ground used to access the sewers or other underground vaults and installations.
2. A hole providing access to the inside of a boiler, tank etc.
3. The anus of man, in a sexual context.