Sentence:  In the experimental animal and in man gross deficiency in dietary iodine causes thyroid <WSD>hyperplasia</WSD> , hypertrophy and increased thyroid activity ( Money , Rall and Rawson , 1952 ; Stanbury , Brownell , Riggs , Perinetti , Itoiz , and Del Castillo , 1954 ) . 
Meaning of the word marked with <WSD> tags:  abnormal increase in number of cells