Where does “macroserial” come from?

macroserial (Spanish) comes from Spanish serial, from Spanish serie, from Latin seriēs, from Latin serō, from Latin sērus, from Proto-Italic swerjos, from Proto-Indo-European swer-yo-s, from Proto-Indo-European swer- — to ache; to fester; wound; injury.

macroserial (Spanish): long series