A.with sides of uneven length, i.e. oblong, X.Eq. 7.14; ἑτερόμηκες, τό, oblong rectangle, Arist.Cat.11a10, de An.413a17, Euc.1 Def.22.
2. of numbers, not square, i.e. produced by the multiplication of two unequal factors, as 6 = 3 x 2, Pl. Tht.148a, Plu. 2.367f; opp. ἰσόπλευρος (both of line and number), Arist. APo.73b1.