Who came up with the diagnostic word “disorder”?

I just can’t wrap my mind around this: Using the word “disorder” to tell people that they have a mental illness that is nothing to be ashamed of, it’s just like diabetes or any other physical illness.

How can any amount of anti-stigma campaigns neutralize the wrongness that this word conveys?

Merriam-Webster defines it like this:

: a confused or messy state : a lack of order or organization

: a state or situation in which there is a lot of noise, crime, violent behavior, etc.

medical : a physical or mental condition that is not normal or healthy

Full Definition of DISORDER

1 :  lack of order <clothes in disorder>

2 :  breach of the peace or public order <troubled times marked by social disorders>

3 :  an abnormal physical or mental condition <a liver disorder> <a personality disorder>
 

Examples of DISORDER

The mayor is concerned that a rally could create public disorder.

problems of crime and social disorder

Millions of people suffer from some form of personality disorder.

 Related to DISORDER 

Synonyms

chance-medley, confusion, disarrangement, disarray, dishevelment, chaos, disorderedness, disorderliness, disorganization, free-for-all, havoc, heck, hell, jumble, mare's nest, mess, messiness, misorder, muddle, muss, shambles, snake pit, tumble, welter

Antonyms

order, orderliness

Related Words

anarchy, lawlessness, misrule, riot; knot, snarl, tangle; labyrinth, maze, web; maelstrom, storm; bollix, clutter, litter, mishmash, shuffle; hodgepodge, medley, miscellany, morass, motley

Near Antonyms

method, pattern, plan, system