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What does SPAD mean?

Looking for the meaning or definition of the word SPAD? Here's what it means.

Initialism
  1. (rail transport, Britain) signal passed at danger
Noun
  1. (rail transport, Britain) an instance of a signal passed at danger
  2. (politics) A special adviser
  3. (plant science) a relative measurement of the amount of chlorophyll present in a leaf based on measurements with a SPAD meter produced by Minolta
Verb
  1. (rail transport, Britain) to pass a signal at danger
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