Noun
flatback (plural flatbacks)
A chelonid turtle, Natator depressus, with low-domed carapace, endemic to the continental shelf of Australia.
Flatback render Flatback mandolins use a thin sheet of wood with bracing for the back, as a guitar uses, rather than the bowl of the bowlback or the arched back of the carved mandolins. Source: Internet
Double top A variation of the flatback has a double top that encloses a resonating chamber, sound holes on the side, and a convex back. Source: Internet
Like the bowlback, the flatback has a round sound hole. Source: Internet