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.
Anatomy Zoology. 1The jaw or jawbone, specifically the upper jaw in most vertebrates. In humans it also forms part of the nose and eye socket. âThe maxilla fuses with the vomer bone and the nasal septum.â. âAnteriorly, the ventral margin of the maxilla curves dorsally.â. âTwo major bones of the upper jaw, the maxilla, and the premaxilla, were previously firmly attached to the skull and had teeth.â.