He purposely makes us tread the round of the circulus vitiosus, as in the old saw: A Cretan said, all Cretans are liars.
Otherwise the definition is called a circulus in definiendo.
The entire activity of justice is a circulus vitiosus, a faulty short conclusion.
Otherwise the definition is called a circulus in definiendo (defining in a circle).
Decima vero o dicitur teca, circulus, vel cyfra vel figura nichili.
circulus cir·cu·lus (sûr'kyə-ləs)
n. pl. cir·cu·li (-lī')
A ringlike or circular structure.
A circle formed by connecting arteries, veins, or nerves.