The story
from the nickname of one the scientists who predicted its properties in 1963 and the underlying concept of valence tautomerism, William "Bull" Doering. Chosen to rhyme with fulvalene.
Etymology from Wiktionary, CC BY-SA 4.0.
bullvalene
Today it means: A tricyclic hydrocarbon whose structure is constantly changing between 1,209,600 possible tautomers Full definition →