Coss (k?s), n. [Cf. Pers. ks a road measure of about two miles; or Skr. kra.]
A Hindoo measure of distance, varying from one and a half to two English miles.
Whitworth.
© Webster 1913.
Coss, n. [It. cosa.]
A thing (only in phrase below).
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.]
© Webster 1913.