The Collaborative International Dictionary of English v.0.48:

Cursores \Cur*so"res\ (k?r-s?"rEz), n. pl. [L. cursor, pl.
   cursores, a runner.] (Zool.)
   (a) An order of running birds including the ostrich, emu, and
       allies; the Ratita[ae].
   (b) A group of running spiders; the wolf spiders.
       [1913 Webster]