noun, plural antennas for 1, antennae [an-ten-ee] , for 2.
a conductor by which electromagnetic waves are sent out or received, consisting commonly of a wire or set of wires; aerial.
Zoology. one of the jointed, movable, sensory appendages occurring in pairs on the heads of insects and most other arthropods.

1640–50; < Latin: a sailyard

antennal, adjective
postantennal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antenna (ænˈtɛnə)
n , -nae, -nas
1.  one of a pair of mobile appendages on the heads of insects, crustaceans, etc, that are often whiplike and respond to touch and taste but may be specialized for swimming or attachment
2.  another name for aerial
[C17: from Latin: sail yard, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1640s, "feeler or horn of an insect," from L. antenna "sail yard," the long yard that sticks up on some sails, of unknown origin, perhaps from PIE base *temp- "to stretch, extend." In this sense, it is a loan-transl. of Gk. keraiai "horns" (of insects). Modern use in radio, etc., for "aerial wire" is
from 1902.

nativized pl. of antenna; see -ae.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
antenna   (ān-těn'ə)  Pronunciation Key 
  1. One of a pair of long, slender, segmented appendages on the heads of insects, centipedes, millipedes, and crustaceans. Most antennae are organs of touch, but some are sensitive to odors and other stimuli.

  2. A metallic device for sending or receiving electromagnetic waves, such as radio waves. Some antennas can send waves in or receive waves from all directions; others are designed to work only in a range of directions.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Radio waves have broadcast information to tiny antennas for decades.
For technical reasons, they had to track them with hand-held and
  helicopter-mounted antennas.
In this day and age, fewer and fewer people are relying on antennas anyway.
Such a delay might also avoid a spate of homeowners sliding off icy rooftops as
  they struggle to install new antennas.
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