What do a.m. and p.m. stand for?

scanning line

(in a cathode-ray or television tube) a single horizontal trace made by the electron beam in one traversal of the fluorescent screen.
Compare frame (def 9).
Origin of scanning line
1925-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for scanning line
  • The laser draws an image onto the screen by scanning line by line from top to bottom.
  • In facsimile transmission, the portion of the scanning line that can be specifically used for image signals.
  • The process that established a fixed level for the picture level at the beginning of each scanning line.

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