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Insects, myriapods, and crustaceans all have a pair of thin, protruding sensory organs on their heads called antennae (the plural form of antenna). The term can also refer to a metallic wire or rod that is used for receiving or transmitting radio waves.
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"Insect antennae" by Pearson Scott Foresman is licensed under Public Domain.
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Merriam-Webster Online
N.d. Antenna. http://www.merriam-webster.com/dictionary/antenna, accessed October 30, 2014.