n, pl  -gies  1  :  a branch of biology that deals with the functions and activities of life or of living matter (as organs, tissues, or cells) and of the physical and chemical phenomena involved - compare ANATOMY1 MORPHOLOGY1    2  :  the organic processes and phenomena of an organism or any of its parts or of a particular bodily process <the of the thyroid gland>   3  :  a treatise on physiology .
 
 
 
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