a count of the amount of pollen in the air, based on the average of the number of pollen grains that collect on slides exposed to the air for a given period of time.
[ 1925-30 ]
a count of the amount of pollen in the air, based on the average of the number of pollen grains that collect on slides exposed to the air for a given period of time.
[ 1925-30 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012