lymphangiogram vs radiograph

lymphangiogram

noun
  • A diagnostic image produced by lymphangiography. 

radiograph

noun
  • An image, often a photographic negative, produced by radiation other than normal light; especially an X-ray photograph. 

  • An instrument for measuring and recording solar radiation. 

verb
  • To produce a radiograph image. 

How often have the words lymphangiogram and radiograph occurred in a corpus of books? (source: Google Ngram Viewer )