Spray1  —n. 1 water etc. Flying in small drops. 2 liquid sprayed with an aerosol etc. 3 device for this. —v. 1 (also absol.) Throw (liquid) as spray. 2 (also absol.) Sprinkle (an object) thus, esp. With insecticide. 3  (of a tom-cat) mark its environment with urine, to attract females.  sprayer n. [origin uncertain]