Where does “paroxismo” come from?

paroxismo (Spanish) comes from Medieval Latin paroxysmus, from Ancient Greek παροξυσμός, from Ancient Greek παροξύνω, from Ancient Greek πᾰρᾰ-, from Ancient Greek παρά, from Latin verēdus, from Gaulish werēdos, from Proto-Celtic *uɸoreidos — horse.

paroxismo (Spanish): paroxysm a random or sudden outburst of activity

Definitions

paroxysm a random or sudden outburst of activity

Ancestry of “paroxismo”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	paroxysmus	severe illness, fit of agony, paroxysm
2	Ancient Greek	παροξυσμός	irritation, the severe fit of a disease
3	Ancient Greek	παροξύνω	to urge, prick, spur on, stimulate
4	Ancient Greek	πᾰρᾰ-	near; next to; by, near
5	Ancient Greek	παρά
6	Latin	verēdus	A fast or light breed of horse; courier's horse; hunter
7	Gaulish	werēdos	horse
8	Proto-Celtic	*uɸoreidos	horse

Every word from Proto-Celtic *uɸoreidos →Every word from Ancient Greek πᾰρᾰ- →Every word from Gaulish werēdos →