microorganism, microbe

microbiology

Kyūjitai form of 微生物学 (“microbiology”)

bacteriology

to study / to learn

(microbiology) to culture

(microbiology) culture

(software engineering) class diagram - A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

bacterium; germ

(education) class (group of students in a regularly scheduled meeting with a teacher) / class of things (typically products) sharing certain features / (programming, object-oriented programming) class