his·to·log·i·cal \ˈhistə|läjə̇kəl, -jēk-\adjective alsohis·to·log·ic\-jik, -jēk\ : of or relating to histology or to the microscopic structure of the tissues of organisms < histological studies > < the histological picture in Bright's disease > • his·to·log·i·cal·ly\-jə̇k(ə)lē, -jēk-, -li\adverb