The Collaborative International Dictionary of English v.0.48:
Diophantine \Di`o*phan"tine\, a. Originated or taught by Diophantus, the Greek writer on algebra. [1913 Webster] Diophantine analysis (Alg.), that branch of indeterminate analysis which has for its object the discovery of rational values that satisfy given equations containing squares or cubes; as, for example, to find values of x and y which make x^2 + y^2 an exact square. [1913 Webster]