Plural of antenna; devices for transmitting or receiving radio waves, or the sensory appendages on insects and crustaceans. Both biological and technological sensing structures.
From Latin antenna meaning 'sail yard' (the horizontal pole supporting a ship's sail). Applied to insect feelers by analogy to ship rigging, then to radio equipment for similar reasons.
It's remarkable that we use the same word for insect feelers and radio equipment - both are essentially sensory extensions that detect invisible information from the environment. This linguistic parallel reflects intuitive understanding that both biological and technological antennas serve the same fundamental function.
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