No, “Dweep” (or Dvīp) in Jainism is not a galaxy.

In Jain cosmology:

• A Dweep means a continent-island (like Jambu Dweep, Dhātakikhand Dweep, etc.).
• These Dweeps are parts of the middle world (Madhya Lok) where beings live.
• A galaxy is a modern astronomy term (collection of stars, planets, etc.) and does not match the Jain use of the word Dweep.

So:

• Dweep = continent / island-region in the Jain universe map.
• Not a galaxy.