The story
From de- + pyrimidine + -ation.
Etymology from Wiktionary, CC BY-SA 4.0.
depyrimidination
Today it means: A process in which the chemical bond linking a pyrimidine (cytosine or thymine) to a deoxyribose sugar breaks spontaneously. It occurs at a lower rate compared to depurination with only 500 cytosine and thymine bases lost per cell per day in a typical mammalian cell. Full definition →