cham·per·ty 
(chămpər-tē)
(chămpər-tē)n. pl. cham·per·ties
A sharing in the proceeds of a lawsuit by an outside party who has funded or assisted in funding the litigation.
[Middle English champartie, from Old French champart, the lord's share of the tenant's crop, from Medieval Latin campars, campīpars : Latin campī, genitive of campus, field; see CAMPUS + Latin pars, part; see PART.]
champer·tous (-təs) adj.