Plural of hatchway; multiple openings in decks or roofs with hatches that can be opened or closed.
Hatchway (hatch + way) + -s plural suffix. Simply the plural form indicating multiple hatchway openings.
A large cargo ship might have 10-20 hatchways, and coordinating their opening and closing is a complex operation that ships have optimized for centuries!
Complete word intelligence in one call. Free tier — 50 lookups/day.