Lewis Short
(adjective) : dēfectīvus, a, um, [deficio
* No. III.), imperfect, defective (post-class.): et abortiva genitura,Tert. adv. Val. 14: febris,intermittent fever,Cael. Aur. Acut. 2, 10.
* In gramm.: nomina, verba, some of whose forms are wanting,defective,Charis. 3.
Charlton T. Lewis, Charles Short, A Latin Dictionary