The hormone secreted by the pituitary gland which stimulates and regulates growth.
Human somatotropin, a protein hormone made in the pituitary gland. Lab-grown (HGH) bacteria given a copy of the gene for human growth hormone can then produce large amounts of HGH, which can be purified and used to treat certain kinds of human dwarfismþa pathological condition of growth arrested by various causes. 
somatotropin. Abbr.: hGH