Sense file
How the sense moved
The archive follows the dated record first, then reads the social or rhetorical pressure that hardened, softened, narrowed, or reversed the word.
Older meaning
Related to poison, especially in a material or biological sense.
Modern meaning
Poisonous, or metaphorically harmful in social life.
Research lens
One of the clearest modern examples of a scientific word turning into social diagnosis.
Meaning trail
Root
poison
The harm was physical first.
Older sense
materially poisonous
Science and medicine anchored the word.
Now
poisonous or socially harmful
Metaphor widened the blast radius.