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skeleton. 1  the hard framework of an animal body, supporting the tissues and protecting the organs; specif., all the bones collectively, or the bony framework, of a human being or other vertebrate animal. 2  anything like a skeleton in any of various ways a very lean or emaciated person or animal.
A fossil skeleton is not hard to understand, it is mineralized bone. Impressions are similar to pressing a leaf in a book to dry and preserve it. A cast is a little different. A cast is defined as: The secondary rock or mineral that fills a natural mold, producing a replica of a fossil. (emphasis added) Bates, R. L., Jackson, J. A., editors, (prepared by the American Geological Institute), 1976, Dictionary of Geological Terms, third edition; Anchor Books (Doubleday).