quadrilateral figures
Of quadrilateral figures ,
a square is that which is both equilateral and right-angled;
an oblong that which is right-angled but not equilateral;
a rhombus that which is equilateral but not right-angled;
and a rhomboid that which has its opposite sides and angles equal to one another but is neither equilateral nor right-angled.
And let quadrilaterals other than these be called trapezia.
—Euclid