Definition from Wiktionary, the free dictionary
See also: spad
SPAD (plural SPADs)
- (rail transport, Britain) an instance of a signal passed at danger
- (politics, Britain) A special adviser.
- (plant science) a relative measurement of the amount of chlorophyll present in a leaf based on measurements with a SPAD meter produced by Minolta
- (rail transport, Britain) to pass a signal at danger