An orangerie is a greenhouse or conservatory used for growing citrus trees, such as orange and lemon trees. However, if you're looking for synonyms for orangerie, there are a few terms that come close to describing its function and purpose. For example, a greenhouse is a structure designed to grow plants in a controlled environment, just like an orangerie. Similarly, a conservatory or hothouse refers to a building erected for growing delicate plants and flowers that require a more regulated temperature and humidity. Before you know it, you'll be able to add terms like greenhouse, conservatory, and hothouse to your vocabulary to refer to an orangerie!