An organ or appendage used to touch or sense, like an insect's antenna, or a person who feels or perceives.
From 'feel' (Old English 'felan') + '-er' (agent suffix). Originally referred to sensory appendages in insects, later extended to mean anyone who senses or perceives.
Feelers are evolutionary marvels—an insect's antennae are covered in chemoreceptors that can detect a single molecule of pheromone from miles away, making them infinitely more sensitive than human fingers.
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