Webster's English Dictionary

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antenna

an.ten.na \an-'ten-*\ \-'ten-(.)e-\ \-'ten-*l\ n or an.ten.nae or antennas 
   [ML, fr. L, sail yard] pl  1: a movable segmented organ of sensation on the 
   head of insects, myriapods , and crustaceans pl usu antennas  2: a usu. 
   metallic device (as a rod or wire) for radiating or receiving rad io waves 
   - an.ten.nal aj