n, pl  -gies  1  :  a branch of anatomy that deals with the minute structure of animal and plant tissues as discernible with the microscope - compare GROSS ANATOMY   2  :  a treatise on histology  3  :  tissue structure or organization his*to*log*i*cal or  his*to*log*ic  adj his*to*log*i*cal*ly adv 
 
 
 
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