A Hatch

1. A horizontal door in a floor or ceiling.
2. A trapdoor.
3. An opening in a wall at window height for the purpose of serving food or other items. A pass through.
4. A small door in large mechanical structures and vehicles such as aircraft and spacecraft often provided for access for maintenance.
5. (nautical) An opening through the deck of a ship or submarine
6. (slang) A gullet.
7. A frame or weir in a river, for catching fish.
8. A floodgate; a sluice gate.
9. (Scotland) A bedstead.
10. (mining) An opening into, or in search of, a mine.