From Longman Dictionary of Contemporary Englishfeelerfeel‧er /ˈfiːlə $ -ər/ noun [countable usually plural] 1 HBIone of the two long things on an insect’s head that it uses to feel or touch things. Some sea animals also have feelers.2 → put out feelers
Examples from the Corpus
feeler• Clive felt delicate feelers worming through his mind, draining his pain, his fear.• Sea-anglers dot the foreshore, their rods like the jittery feelers of crayfish or the dials of a Geiger counter.• Hanoi, meanwhile, had sent out peace feelers. 