or·​tho·​di·​a·​gram -ˈdī-ə-ˌgram How to pronounce orthodiagram (audio)
: 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

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Cite this Entry

“Orthodiagram.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/orthodiagram. Accessed 8 Dec. 2023.

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