infectar
/infeɡˈtaɾ/ · B1 · verb
to infect (to bring into contact with a substance that causes illness)
🦠 infectar = in + fect, from Latin inficere: to put something in, to taint
Latin inficere meant to dip in or stain, from in (into) + facere (to make, put). English infect has the same root. Spanish turns the ending into -ar, so to infect becomes infectar.