ănătŏcismus, i, m., = ἀνατοκισμός,
interest upon interest , compound interest (twice in Cic.): centesimae cum anatocismo anniversario, Cic. Att. 5, 21, 11; 5, 21, 12; Inscr. Orell. 4405.
anatocismus ī, m , ἀνατοκισμός, interest upon interest, compound interest. ...
An Elementary Latin Dictionary