under a/the microscope

: in or into a position below or beneath something

: below or short of some quantity, level, or limit

: in or into a condition of subjection, subordination, or unconsciousness

: below or beneath so as to be overhung, surmounted, covered, protected, or concealed by

: subject to the authority, control, guidance, or instruction of

: receiving or undergoing the action or effect of

: lying or placed below, beneath, or on the ventral side

: facing or protruding downward

: lower in rank or authority : subordinate

: an optical instrument consisting of a lens or combination of lenses for making enlarged images of minute objects

: a non-optical instrument (such as one using radiations other than light or using vibrations) for making enlarged images of minute objects