The Collaborative International Dictionary of English v.0.48:

Rejectamenta \Re*jec`ta*men"ta\ (r?-j?k`t?-m?n"ta), n. pl. [NL.,
   fr. L. rejectare, v. intens. fr. rejicere. See Reject.]
   Things thrown out or away; especially, things excreted by a
   living organism. --J. Fleming.
   [1913 Webster]