cupola

noun

1. 1

   A dome-shaped ornamental structure located on top of a larger roof or dome.

2. 2

   A small turret, usually on a hatch of an armoured fighting vehicle.

3. 3

   An upward-projecting mass of plutonic rock extending from a larger batholith.

4. 4

   A solid formed by joining two polygons, one (the base) with twice as many edges as the other, by an alternating band of isosceles triangles and rectangles.

5. 5

   A type of furnace used for smelting.

6. 6

   A small cap over a structure that is shaped like a dome or inverted cup.

   “the posterior cupola of the cartilaginous nasal capsule”

7. 7

   A small viewing window in the top of the caboose for looking over the train, or the part of the caboose where one looks through this window.