Deleria
1. a state of excitement and mental confusion, often accompanied by hallucinations, caused by high fever, poisoning, brain injury, etc
2. violent excitement or emotion; frenzy
The death was subject to an inquest so may be felt to be out of the ordinary and the usual medical Dr was not able to sign. The addtional text states 'shock' as well.
Not sure when this certificate was issued. This can have an effect on what illnesses were known as.
A modern day definition of delerium is here
https://my.clevelandclinic.org/health/diseases/15252-deliriumWhere it comes on suddenly as a result of fever etc they try to reduce the fever so that the delerium is minimised.
You might be able to locate the results of the inquest.
letting us know the date of the certificate might help as well
My brain keeps telling me the word is 'praecox' but I don't think it is.