For the noun: antenna
Plural form: antennas, antennae

WordReference Random House Learner's Dictionary of American English © 2019
an•ten•na /ænˈtɛnə/USA pronunciation   n.[countable]pl.  -ten•nas for 1., -ten•nae /-ˈtɛni/USA pronunciation  for 2.
  1. Electricityan aerial;
    a wire or set of wires attached to metal rods by which radio or television signals are sent out or received.
  2. one of the two long, thin, jointed, movable parts on the heads of insects, lobsters, and related animals that can feel or sense things in the surroundings.

WordReference Random House Unabridged Dictionary of American English © 2019
an•ten•na  (an tenə),USA pronunciation n., pl.  -ten•nas  for 1, -ten•nae (-tenē)USA pronunciation for 2.
  1. Electricitya conductor by which electromagnetic waves are sent out or received, consisting commonly of a wire or set of wires;
  2. [Zool.]one of the jointed, movable, sensory appendages occurring in pairs on the heads of insects and most other arthropods. See diag. under  insect. 
an•tennal, adj. 
  • Latin: a sailyard
  • 1640–50

Collins Concise English Dictionary © HarperCollins Publishers::

antenna /ænˈtɛnə/ n
  1. ( pl -nae / -naɪ/) 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. ( pl -nas)
    another name for aerial
Etymology: 17th Century: from Latin: sail yard, of obscure origin

anˈtennal, anˈtennary adj

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