English
immunodiffusion
From immuno- + diffusion.
A compound of immuno- + diffusion
Proto-Indo-European *ǵʰewd- ‘to pour’
…
Proto-Italic *hundō ‘to pour out’
Latin fundō ‘to pour out, shed’
Latin diffundō ‘to diffuse, scatter’
Latin diffūsiō ‘spreading out, increase in extent or breadth’
English diffusion
Today it means
noun a technique used to detect the reaction between an antigen and an antibody by observing the behavior of a combination of such species as they diffuse through a gel
Language periods are conventional ranges, not dates for this word.
Etymograph / immunodiffusion