antenna

noun5

1. •
   An appendage used for sensing on the head of an insect, crab, or other animal.

   • The overall shape of most insect antennae is elongate and cylindrical, although elaborations into plumose, lamellate, or pectinate forms have arisen many times in different insect lineages. — 2006
2. •
   An apparatus to receive or transmit electromagnetic waves and convert respectively to or from an electrical signal.
3. •
   (figurative) The faculty of intuitive astuteness.

   • Most nurses believe they are born with an antenna of sorts, which is able to guide them through clinical practice and help them determine what is right and what is not... — 2006
4. •
   The spar to which a lateen sail is attached, which is then hoisted up the mast.
5. •
   A fragment of an oligosaccharide