noun, verb, -neled, -nel⋅ing or (especially British
) -nelled, -nel⋅ling.| 1. | the bed of a stream, river, or other waterway. |
| 2. | Nautical. a navigable route between two bodies of water. |
| 3. | the deeper part of a waterway. |
| 4. | a wide strait, as between a continent and an island. |
| 5. | a course into which something may be directed: He hoped to direct the conversation to a new channel. |
| 6. | a route through which anything passes or progresses: channels of trade. |
| 7. | channels, the specific, prescribed, or official course or means of communication: In an emergency he was able to reach the governor without going through channels. |
| 8. | a groove or furrow. |
| 9. | a means of access: He considers the Senate a channel to the White House. |
| 10. | Architecture.
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| 11. | (in jazz or popular music) a bridge. |
| 12. | a frequency band of sufficient width for one- or two-way communication from or to a transmitter used for television, radio, CB radio, telephone, or telegraph communication. |
| 13. | Computers. a path for the transfer of signals or data within a computer or between a computer and its peripheral equipment. |
| 14. | either of the two signals in stereophonic or any single signal in multichannel sound recording and reproduction. |
| 15. | Cell Biology. a transient opening made by a protein embedded in a cell membrane, permitting passage of specific ions or molecules into or out of the cell: calcium channel. |
| 16. | a tubular passage for liquids or fluids. |
| 17. | Building Trades.
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| 18. | to convey through or as through a channel: He channeled the information to us. |
| 19. | to direct toward or into some particular course: to channel one's interests. |
| 20. | to excavate as a channel. |
| 21. | to form a channel in; groove. |
| 22. | to become marked by a channel: Soft earth has a tendency to channel during a heavy rain. |
channel
channelling
in solid-state physics, the directionally selective penetration of crystalline solids by a beam of atoms. The effect was predicted in 1912 by the German physicist Johannes Stark but was not confirmed until 1960. The directions in which penetration is greatest characteristically are parallel to crystallographic axes, or planes, and the paths followed by the particles are called channels. For example, heavy atoms pass almost unobstructed through suitably oriented aluminum crystals, traversing distances thousands of times those achieved in nonchanneling directions. The phenomenon is useful in studies of crystal structure and in atomic, nuclear, and solid-state physics and holds promise with regard to the fabrication of semiconductors.
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