feeler (Noun) — One of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste.
feeler (Noun) — A tentative suggestion designed to elicit the reactions of others. ex. "she rejected his feelers"
feeler (Noun) — Sensitivity similar to that of a receptor organ. ex. "he had a special feeler for public relations"
feeler (Noun) — Slender tactile process on the jaws of a fish.