Microscopical :: Microscopical (a.) Of or pertaining to the microscope or to microscopy; made with a microscope; as, microscopic observation..
Microscopical :: Microscopical (a.) Very small; visible only by the aid of a microscope; as, a microscopic insect..
Microscopically :: Microscopically (adv.) By the microscope; with minute inspection; in a microscopic manner.