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 for Channel bar
From The Collaborative International Dictionary of English v.0.48 :

  Channel \Chan"nel\ (ch[a^]n"n[e^]l), n. [OE. chanel, canel, OF.
     chanel, F. chenel, fr. L. canalis. See Canal.]
     1. The hollow bed where a stream of water runs or may run.
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     2. The deeper part of a river, harbor, strait, etc., where
        the main current flows, or which affords the best and
        safest passage for vessels.
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     3. (Geog.) A strait, or narrow sea, between two portions of
        lands; as, the British Channel.
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     4. That through which anything passes; a means of passing,
        conveying, or transmitting; as, the news was conveyed to
        us by different channels.
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              The veins are converging channels.    --Dalton.
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              At best, he is but a channel to convey to the
              National assembly such matter as may import that
              body to know.                         --Burke.
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     5. A gutter; a groove, as in a fluted column.
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     6. pl. [Cf. Chain wales.] (Naut.) Flat ledges of heavy
        plank bolted edgewise to the outside of a vessel, to
        increase the spread of the shrouds and carry them clear of
        the bulwarks.
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     7. pl. official routes of communication, especially the
        official means by which information should be transmitted
        in a bureaucracy; as, to submit a request through
        channels; you have to go through channels.
     8. a band of electromagnetic wave frequencies that is used
        for one-way or two-way radio communication; especially,
        the frequency bands assigned by the FTC for use in
        television broadcasting, and designated by a specific
        number; as, channel 2 in New York is owned by CBS.
     9. one of the signals in an electronic device which receives
        or sends more than one signal simultaneously, as in
        stereophonic radios, records, or CD players, or in
        measuring equipment which gathers multiple measurements
     10. (Cell biology) an opening in a cell membrane which serves
         to actively transport or allow passive transport of
         substances across the membrane; as, an ion channel in a
         nerve cell.
     11. (Computers) a path for transmission of signals between
         devices within a computer or between a computer and an
         external device; as, a DMA channel.
     Channel bar, Channel iron (Arch.), an iron bar or beam
        having a section resembling a flat gutter or channel.
     Channel bill (Zool.), a very large Australian cuckoo
        ({Scythrops Nov[ae]hollandi[ae].
     Channel goose. (Zool.) See Gannet.
        [1913 Webster]

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