Where does “quat'” come from?

quat' (Norman) comes from Old French quatre, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

quat' (Norman): four

Definitions

four

Ancestry of “quat'”, step by step

Step	Language	Word	Meaning
1	Old French	quatre	four
2	Latin	quattŭor	four; 4
3	Portuguese	quarto	ordinal form of quatro; fourth; quarter; fourth;...
4	Old Portuguese	quarto	quarter
5	Latin	quārtus	fourth
6	Proto-Indo-European	kʷeturtos	—
7	Proto-Indo-European	kʷetwóres	four
8	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 →