Where does “cuadradura” come from?

cuadradura (Spanish) comes from Old Spanish quadradura, from Latin quadratura, from Latin quadrō, from Latin quādrus, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus — and.

Ancestry of “cuadradura”, step by step

Step	Language	Word	Meaning
1	Old Spanish	quadradura	quadrature, squaring
2	Latin	quadratura	a squaring, making square, quadrature; a square
3	Latin	quadrō	to make four-cornered, square, make square
4	Latin	quādrus	square
5	Latin	quattŭor	four; 4
6	Portuguese	quarto	ordinal form of quatro; fourth; quarter; fourth;...
7	Old Portuguese	quarto	quarter
8	Latin	quārtus	fourth
9	Proto-Indo-European	kʷeturtos	—
10	Proto-Indo-European	kʷetwóres	four
11	Proto-Indo-European	kʷe-	and

Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-European kʷeturtos →