Source : Webster's Revised Unabridged Dictionary (1913)

Hatchway \Hatch"way`\, n.
   A square or oblong opening in a deck or floor, affording
   passage from one deck or story to another; the entrance to a
   cellar.

Source : WordNet®

hatchway
     n : an entrance equipped with a hatch; especially a passageway
         between decks of a ship [syn: {opening}, {scuttle}]