You searched for: “lipogrammatism
lipogrammatism
1. The art or practice of writing lipograms; texts or writings which exclude a particular letter or particular letters of the alphabet.
2. A written work that is composed of words chosen so as to avoid the use of one or more specific alphabetical characters.

An example of lipogrammatism: "It is an odd kink of humanity which cannot find any valuation in spots of natural glory." This sentence omits the letter "e".

—from Gadsby by Ernest Vincent Wright, 1939.