cast.orum N 2 2 GEN P N
castum, casti N (2nd) N [XEXES] uncommon
festival/period of ceremonial/required abstinence/continence dedicated to a god
cast.orum ADJ 1 1 GEN P M POS
cast.orum ADJ 1 1 GEN P N POS
castus, casta -um, castior -or -us, castissimus -a -um ADJ [XXXAO]
pure, moral; chaste, virtuous, pious; sacred; spotless; free from/untouched by;
castor.um N 3 1 GEN P M
Castor, Castoris N (3rd) M [XYHCO]
Castor; (twin to Pollux, brother to Helen); St Elmo's fire (pl.), corposant;
castor, castoris N (3rd) M [XAXDO] lesser
castor.um N 3 7 GEN P M
castor, castoros/is N M [XAXEO] uncommon
beaver (Castor fiber);

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.