an·ten·na 
(ăn-tĕnə)
(ăn-tĕnə)n. pl. an·ten·nae (-tĕnē)
1.
a. Zoology One of the paired, flexible, segmented sensory appendages on the head of an insect, myriapod, or crustacean functioning primarily as an organ of touch.
b. Something likened to this sensory appendage, as in function or form: sensitive public relations antennae.
2. A structure in a photosynthetic organism containing pigment molecules that absorb light energy and transfer it to a reaction center composed of proteins and pigments, where the light energy is converted into chemical energy.
3. pl. an·ten·nas A metallic apparatus for sending or receiving electromagnetic waves.
[Medieval Latin, from Latin, sail yard, translation of Greek keraia, insect feeler, yardarm.]
an·tennal adj.
antennaantennae of an adult antlion