shade ball
Noun
Meaning
shade ball (plural shade balls)
A small plastic sphere floated in large numbers on top of a reservoir, pool, etc. to slow evaporation, block sunlight, or deter birds from landing.
Synonym: bird ball
Noun
shade ball (plural shade balls)
A small plastic sphere floated in large numbers on top of a reservoir, pool, etc. to slow evaporation, block sunlight, or deter birds from landing.
Synonym: bird ball