feeler in WordNet English dictionary

1. a tentative suggestion designed to elicit the reactions of others
   "she rejected his advances"
   overture  advance  approach  feeler 
   
2. one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste
   antenna  feeler 
   
3. sensitivity similar to that of a receptor organ
   "he had a special antenna for public relations"
   antenna  feeler 
   
4. slender tactile process on the jaws of a fish
   barbel  feeler