Grattage. a method of drawing by scratching paper or cardboard that has been covered with india ink with a pen or a sharp instrument. The grattage process is reminiscent of scraping an oiled surface in lithography.rattage. a method of drawing by scratching paper or cardboard that has been covered with india ink with a pen or a sharp instrument. The grattage process is reminiscent of scraping an oiled surface in lithography.
3. (Zoology) of or relating to the surface of an animal, such as a jellyfish, on which the mouth is situated. 4. (Medicine) denoting a drug to be taken by mouth Compare parenteral: an oral contraceptive.
Human tooth - Anatomy. 1  Dental anatomy is a field of anatomy dedicated to the study of tooth structure. 2  The anatomic crown of a tooth is the area covered in enamel above the cementoenamel junction (CEJ) or neck of the tooth. 3  Humans usually have 20 primary (deciduous, baby or milk) teeth and 32 permanent (adult) teeth.