English
seroreactive
From sero- + reactive.
Proto-Indo-European *ser- ‘to flow, run’
Proto-Indo-European *sér-o- ‘flowing, liquid’
Proto-Italic *serom ‘liquid’
Latin serum ‘some other watery liquid’
English sero-
Today it means
adj That reacts (e.g. to a virus) in blood serum
Language periods are conventional ranges, not dates for this word.
Etymograph / seroreactive