noun (n)

• a milky exudate from certain plants that coagulates on exposure to air(noun.substance)

  source: wordnet30
• a water-base paint that has a latex binder(noun.artifact)

  Synonym:
  latex paint, rubber-base paint
  

  source: wordnet30
• A milky or colored juice in certain plants in cavities (called latex cells or latex tubes). It contains the peculiar principles of the plants, whether aromatic, bitter, or acid, and in many instances yields caoutchouc upon coagulation.(noun)

  source: webster1913