the dispersion of fungicides or insecticides or fertilizer on growing crops (often from a low-flying aircraft)
"The pilot announced that they would begin spraying the soybean fields early in the morning to protect them from pests."
the application of a liquid in the form of small particles ejected from a sprayer
"The gardener spent an hour spraying the rose bushes to keep them free of aphids."
The act by which something is sprayed.
"The house smelled of rain and wet pavement after hours of spraying from a passing truck."
present participle of spray
"The gardener is spraying the roses to keep them free from pests."