The Collaborative International Dictionary of English v.0.48:

Cultus \Cul"tus\ (k?l"t?s), n. sing. & pl.; E. pl. Cultuses
   (-?z). [L., cultivation, culture. See Cult.]
   Established or accepted religious rites or usages of worship;
   state of religious development. Cf. Cult, 2.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cultus \Cul"tus\, a. [See Cultus cod.]
   Bad, worthless; no good. [Northwestern U. S.]

         "A bad horse, cultus [no good] !" he said, beating it
         with his whip.                           --F. H. Balch.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

cultus
    n 1: a system of religious beliefs and rituals; "devoted to the
         cultus of the Blessed Virgin" [syn: cult, cultus,
         religious cult]