English
addling
From addle + -ing.
A compound of addle + -ing
Proto-Germanic *adalaz ‘liquid manure’
Proto-West Germanic *adal
Old English adel ‘mire, pool, liquid excrement’
Middle English adel ‘rotten’
English addle
Today it means
noun The act of causing fertilised eggs to lose viability, by killing the developing embryo within through shaking, piercing, freezing or oiling, without breaking the shell or other outer layer.
Language periods are conventional ranges, not dates for this word.
Etymograph / addling