febrīcŭla, ae, f. dim. [febris],
a slight fever (rare but class.): febriculam habere, Cic. Att. 6, 9, 1: in febriculam incidere, Planc. ap. Cic. Fam. 10, 21 fin. —In plur.: lentis febriculis diu detineri, Cels. 2, 17.
febricula ae, f dim.febris, a slight fever : incipit: febriculam habere. ...
An Elementary Latin Dictionary