feeler

noun

1. 1

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

2. 2

   slender tactile process on the jaws of a fish

3. 3

   sensitivity similar to that of a receptor organ

   he had a special antenna for public relations

4. 4

   a tentative suggestion designed to elicit the reactions of others

   she rejected his advances