noun \-ˈdī-ə-ˌgram\

Definition of ORTHODIAGRAM

: a tracing showing the outer contours and exact size of an organ (as the heart) made by illuminating the edge of the organ with parallel X-rays through a small movable aperture and marking the outer edge of the shadow cast upon a fluoroscopic screen

Seen & Heard

What made you want to look up orthodiagram? Please tell us where you read or heard it (including the quote, if possible).