noun (n)

• a gelatinous substance secreted by plants(noun.substance)

  source: wordnet30
• cement consisting of a sticky substance that is used as an adhesive(noun.substance)

  Synonym:
  glue, gum
  

  source: wordnet30
• A gummy or gelatinous substance produced in certain plants by the action of water on the cell wall, as in the seeds of quinces, of flax, etc.(noun)

  source: webster1913