/keuhn trohld"ri lees"/ , adj.
(of a substance, as a medicine or insecticide) released or activated at predetermined intervals or gradually over a period of time.
/keuhn trohld"ri lees"/ , adj.
(of a substance, as a medicine or insecticide) released or activated at predetermined intervals or gradually over a period of time.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012