Orangery or Conservatory?

It is my current fixation, and I like to be precise, so was wondering if the terms were interchangeable, or if there was a distinction?

A little research indicates that the fundamental difference between the two structures is that conservatories have walls entirely of glass whereas orangeries will have partial side elevations constructed from hardwood or stone.

Sources: {1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12}

Formal or informal, simple or elaborate, I think it would be a dreamy addition.