Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.
  • n. Something likened to this sensory appendage, as in function or form: sensitive public relations antennae.
  • n. A metallic apparatus for sending or receiving electromagnetic waves.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A feeler organ on the head of an insect, crab, or other animal.
  • n. An apparatus to receive or transmit radio waves and convert respectively to or from an electrical signal.
  • n. The faculty of intuitive astuteness.

from the GNU version of the Collaborative International Dictionary of English

  • n. A movable, articulated organ of sensation, attached to the heads of insects and Crustacea. There are two in the former, and usually four in the latter. They are used as organs of touch, and in some species of Crustacea the cavity of the ear is situated near the basal joint. In insects, they are popularly called horns, and also feelers. The term in also applied to similar organs on the heads of other arthropods and of annelids.
  • n. A metallic device, variously shaped, designed for the purpose of either transmitting or receiving radio waves, as for radio or television broadcasting, or for transmitting communication signals. Some types are: whip antenna, antenna tower, horn antenna, dish antenna, directional antenna and rabbit ears. See transmitter, receiver.

from The Century Dictionary and Cyclopedia

  • n. One of the lateral articulated appendages occurring in pairs on that segment of the head of an arthropod animal, as an insect, which immediately precedes the mouth or mandibular segment; a feeler or ‘horn.’
  • n. An analogous organ on the heads of other animals, as a feeler or tentacle, like the eye-stalk of a snail.
  • n. plural Projecting horns of iron or bronze found on some ancient helmets, perhaps serving only as ornaments, or as badges, or in some cases to stop a blow from glancing downward and striking the shoulder.
  • n. In Rotifera, a spur-like process bearing a tuft of setæ and projecting from the mid-dorsal line close to the trochal disk. Same as calcar, 4.
  • n. In electricity, the vertical conductor used in wireless telegraphy to send out electric waves (sender) or receive them (receiver).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an electrical device that sends or receives radio or television signals
  • n. sensitivity similar to that of a receptor organ
  • n. one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste

Etymologies

Medieval Latin, from Latin, sail yard, translation of Greek keraia, insect feeler, yardarm.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin antenna, nautical term for yard and common term for pole, of unknown origin. (Wiktionary)

Examples

  • David mouthed the word antenna and pointed at the thing.

    Final Theory

  • I haven't looked at the video, but I wouldn't naturally assume that the antenna is the barrel.

    Boing Boing: February 19, 2006 - February 25, 2006 Archives

  • TV RECEPTION WOES, PT III: No idea if the antenna is "amplified" but I do know the TV doesn't work without it.

    Personal Tech Live with Rob Pegoraro

  • Salem's spiritual antenna is all abuzz during the Halloween season.

    Christians, Pagans Compete (Gently) For Salem's Souls

  • The antenna is a (Yagi?) impedance 50 (ohms? looks like a headset sign); residual wave radiation, - 60dB; Transmission current 1500mA Modulation frequency deviation, 5KHz (mas/minus).

    Where can I get the antenna I need?

  • Also remember that a yagi antenna is directional, so you will need an antenna rotator, so if you choose same.

    Where can I get the antenna I need?

  • However remember that you need a larger satellite dish down here the small about 1 inch by 1 inch antenna is too week for good reception this far south.

    Purchase XM Radio for car?

  • The outdoor antenna is not large (maybe 10-12 inches high).

    Purchase XM Radio for car?

  • It just consists of a pair of dipole antennas -- basically two parallel wires -- which can receive a signal from a powerful radio source such as Jupiter or the Sun. The height of the two wires above the ground determines the angle in the sky where the antenna is focused, and right now that height is fixed to the position of Jupiter when the telescope was first constructed (it's since moved).

    Liveblogging Mars (updated)

  • So, I guess one antenna is enough for a firefly to survive long enough and find a mate to pass on its genes.

    Archive 2009-07-01

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