I’m very disappointed in poem_for_your_sprog for almost understanding this point, and then immediately making the same mistake she was calling out
‘I have to sort my books!’ she cried,
With self-indulgent glee;
With senseless,narcissisticpride:
‘I’m just so OCD!’
‘How random, guys!’ I smiled and said,
Then left without a peep -
And washed my hands until they bled,
And cried myself to sleep.
“In common use in the 19th century” is a liberal interpretation of Havelock Ellis coining the phrase “Narcissus-like” in 1898. Sure, that’s the 19th century for two more years, but the actual word “narcissism” doesn’t appear until 1911, and it’s clearly within a psychiatric context.