noun (n)

• one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste(noun.animal)

  Synonym:
  antenna
  

  source: wordnet30
• a tentative suggestion designed to elicit the reactions of others(noun.communication)

  Synonym:
  advance, approach, overture
  

  source: wordnet30
• sensitivity similar to that of a receptor organ(noun.attribute)

  source: wordnet30
• slender tactile process on the jaws of a fish(noun.animal)

  Synonym:
  barbel
  

  source: wordnet30
• One who, or that which, feels.(noun)

  source: webster1913