English
immunobead
From immuno- + bead.
Proto-Germanic *bedą ‘prayer, entreaty’
Proto-West Germanic *bed ‘prayer’
Proto-West Germanic *gabed ‘prayer’
Old English ġebed ‘prayer’
Middle English bede ‘a prayer’
English bead
Today it means
noun A very small bead coated with an antigen (or antibody) that forms aggregates in the presence of the appropriate antibody (or antigen)
Language periods are conventional ranges, not dates for this word.
Etymograph / immunobead