A "microtome" is a tool or device used in science and medicine to cut extremely thin slices of a material, such as tissue samples, for examination under a microscope. Full definition
Sections are cut at 40 µm thick using a freezing sliding microtome. (chimpanzeebrain.org)
But maybe quantitative analysis of a few select microtomed sections would help. (climateaudit.org)
After the brains equilibrated in sucrose, they were cut into 40 μm coronal sections with a freezing microtome (Leica SM 2000R, Germany). (actaneurocomms.biomedcentral.com)