I confess: until I encountered the term last week, I honestly thought that “pergola” 
was related to “arugula,” and went in salads.
It’s not.
Rather, it’s an archway-like structure — usually in a garden or backyard — that serves as a foundation for vines, ivy, or other climbing plants.
See also, “‘Flatwork,’ Defined“; and, “Stuck in Housing Pergatory.“
