The Collaborative International Dictionary of English v.0.48:

Coss \Coss\ (k[o^]s), n. [Cf. Pers. k[=o]s a road measure of
   about two miles; or Skr. kr[=o][,c]a.]
   A Hindoo measure of distance, varying from one and a half to
   two English miles. --Whitworth.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coss \Coss\, n. [It. cosa.]
   A thing (only in phrase below).
   [1913 Webster]

   Rule of Coss, an old name for Algebra. [It. regola di cosa
      rule of thing, the unknown quantity being called the cosa,
      or the thing.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

coss
    n 1: (in India) a unit of length having different values in
         different localities [syn: kos, coss]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COSS
       Common Object Services Specification


The Free On-line Dictionary of Computing (30 December 2018):

COSS

   Common Object Services Specification in CORBA.