"spittoon," 1779, a colonial word, from Portuguese cuspidor "spittoon," from cuspir "to spit," from Latin conspuere "spit on," from assimilated form of com-, here probably an intensive prefix (see com-), + spuere "to spit" (see spew (v.)).
curvy
cushion
cushy
cusp
cuspid
cuspidor
cuss
custard
custodial
custodian
custody