Etymology
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feeler (n.)

early 15c., "one who feels," agent noun from feel (v.). Of animal organs, 1660s. Transferred sense of "proposal put forth to observe the reaction it gets" is from 1830. Related: Feelers.

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Definitions of feeler

feeler (n.)
one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste;
Synonyms: antenna
feeler (n.)
a tentative suggestion designed to elicit the reactions of others;
Synonyms: overture / advance / approach
feeler (n.)
sensitivity similar to that of a receptor organ;
Synonyms: antenna
feeler (n.)
slender tactile process on the jaws of a fish;
Synonyms: barbel
From wordnet.princeton.edu