A representation (drawing or model) of something in which the outside is omitted to reveal the inner parts WordNet 3.0 & Open English WordNet

A cutaway drawing, also called a cutaway diagram is a 3D graphics, drawing, diagram and or illustration, in which surface elements of a three-dimensional model are selectively removed, to make internal features visible, but without sacrificing the outer context entirely. Wikipedia

A type of drawing based on the design technique to cut away part of the outside to show some of the inner work Wikipedia Disambiguation

A diagram or model having outer layers removed so as to show the interior. Wiktionary

Diagram or model. Wiktionary (translation)