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.
1. gingiva-the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth. gum. animal tissue-the tissue in the bodies of animals. mouth, oral cavity, oral fissure, rima oris-the opening through which food is taken in and vocalizations emerge; he stuffed his mouth with candy.