A hard, brittle, brownish gelatin, obtained by boiling the hides and hoofs of animals to a jelly; when gently heated with water, it is used as a cement for uniting substances. fish-glue (see fish n.1 Compounds 2b). Dutch or Flanders glue: a very fine kind of glue. lip or mouth-glue: a compound of glue and sugar, which can be used by moistening with the tongue.——牛津当代大辞典  @en