dēfectīvus

a, um, adj.
I. no. III.), imperfect, defective (post-class.): et abortiva genitura, Tert. adv. Val. 14: febris, Cael. Aur. Acut. 2, 10.—
II. In gramm.: nomina, verba, some of whose forms are wanting, Charis. 3.
Lewis & Short
A Latin Dictionary, 1879
An open-access project