diophantine

from The Century Dictionary.

• Of or pertaining to Diophantus of Alexandria, a celebrated Greek arithmetician, who flourished in the fourth century.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Originated or taught by Diophantus, the Greek writer on algebra.
• adjective (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 x2 + y2 an exact square.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Alternative form of Diophantine.