Doctor blade is a term used in printing, but if you're looking for synonyms, there are several other terms that you could use interchangeably. For instance, you could use the term "metering blade" which is essentially the same thing. Other synonyms for doctor blade include "wipe blade," "application blade," or simply "blade." People in the printing industry will understand what you mean when you use any of these terms. Doctor blades are essential for removing excess ink and making sure that the printing process runs smoothly. No matter what term you use, the importance of the blade in the printing process cannot be overstated.