Where does “arvorezinha” come from?

arvorezinha (Portuguese) comes from Portuguese árvore, from Old Portuguese arvor, from Cornish mor, from Proto-Brythonic muɨar, from Proto-Celtic smiyoros.

Ancestry of “arvorezinha”, step by step

Step	Language	Word	Meaning
1	Portuguese	árvore	tree
2	Old Portuguese	arvor	tree
3	Cornish	mor	sea; berries
4	Proto-Brythonic	muɨar	—
5	Proto-Celtic	smiyoros	—

Every word from Proto-Celtic smiyoros →Every word from Proto-Brythonic muɨar →Every word from Cornish mor →