Sentence:  This connection was clarified by Smith and Smith ( 1922 ) , who showed that saline extracts of fresh bovine pituitary glands could re-activate the <WSD>atrophied</WSD> thyroids of hypophysectomised tadpoles . 
Meaning of the word marked with <WSD> tags:  (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use