Where does “ectoparasita” come from?

ectoparasita (Portuguese) comes from Portuguese parasita, from Latin parasītus, from Ancient Greek παράσιτος, from Ancient Greek παρά, from Latin verēdus, from Gaulish werēdos, from Proto-Celtic *uɸoreidos — horse.

ectoparasita (Portuguese): ectoparasite parasite living on the surface of host organism

Definitions

ectoparasite parasite living on the surface of host organism

Ancestry of “ectoparasita”, step by step

Step	Language	Word	Meaning
1	Portuguese	parasita	parasite
2	Latin	parasītus	guest
3	Ancient Greek	παράσιτος	one who eats at the table of another, parasite;...
4	Ancient Greek	παρά
5	Latin	verēdus	A fast or light breed of horse; courier's horse; hunter
6	Gaulish	werēdos	horse
7	Proto-Celtic	*uɸoreidos	horse

Every word from Proto-Celtic *uɸoreidos →Every word from Gaulish werēdos →Every word from Latin verēdus →