Coating of solution or slurry drawn to uniform film by use of a knife edge or doctor blade.
Note: The term has been borrowed from printing and coating technologies. It is believed that it derives from the blades employed in letter press equipment that were used to wipe so-called ductor rolls, the term "ductor" becoming doctor over time.
Source:
PAC, 2020, 92, 1861. 'Terminology of polymers in advanced lithography (IUPAC Recommendations 2020)' on page 1872 (https://doi.org/10.1515/pac-2018-1215)