Etymology
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antenna (n.)

1640s, "feeler or horn of an insect or other arthropod," from Latin antenna, antemna "sail yard," the long yard that sticks up on some sails, which is of unknown origin, perhaps from PIE root *temp- "to stretch, extend." In the entomological sense, it is a loan-translation of Aristotle's Greek keraiai "horns" (of insects). Modern use in radio, etc., for "aerial wire" is from 1902. Adjectival forms are antennal (1815), antennary (1833), antennular (1853).

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Definitions of antenna

antenna (n.)
an electrical device that sends or receives radio or television signals;
Synonyms: aerial / transmitting aerial
antenna (n.)
sensitivity similar to that of a receptor organ;
he had a special antenna for public relations
Synonyms: feeler
antenna (n.)
one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste;
Synonyms: feeler
From wordnet.princeton.edu