Where does “britânico” come from?

britânico (Portuguese) comes from Latin britannicus, from Latin Britannia, from Ancient Greek Βρεττανία, from Ancient Greek -ῐ́ᾱ, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

britânico (Portuguese): British; Briton

Definitions

British; Briton

Ancestry of “britânico”, step by step

Step	Language	Word	Meaning
1	Latin	britannicus	British
2	Latin	Britannia	Britain
3	Ancient Greek	Βρεττανία	the British Isles
4	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
5	Proto-Indo-European	-íh₂	—
6	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek Βρεττανία →