[his.tol.o.gy] n, pl -gies [F histologie, fr. hist- + -logie -logy] (ca. 1847) 1: a branch of anatomy that deals with the minute structure of animal and plant tissues as discernible with the microscope
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 -- his.tol.o.gist n