SPAD

Noun

 * 1)  An instance of a signal passed at danger.
 * 2)  A relative measurement of the amount of chlorophyll present in a leaf, based on measurements with a SPAD meter produced by.
 * 3)  ; a self-propelled anti-aircraft vehicle.
 * 1)  ; a self-propelled anti-aircraft vehicle.

Verb

 * 1)  To pass a signal at danger.

Proper noun

 * , a public transport regulatory agency in Malaysia