In 1800s lang=en terms the difference between deringer and derringer
is that deringer is a derringer pistol while derringer is a common misspelling of the Deringer pistol.
As a proper noun Deringer
is a family name of German origin.
deringer
English
(Henry Deringer)
Usage notes
*See derringer for usage notes about spelling variations for the pistol. derringer
English
Noun
(
en noun)
A type of very small, concealable pistol with one or two barrels, but without any loading system or magazine.
Usage notes
The spelling and capitalisation of the word has varied since the pistols were first designed, with Deringer being the original usage. In the late 1850s, misspellings added a double R to the name, Derringer, which remained capitalised. Lower case versions of both spellings were in use soon after. The fifth edition Webster's Collegiate Dictionary in 1937 lists the now common spelling of derringer with lower case D and a single R.
References
* Guns of the Old West, Charles Edward Chapel, 1961. Chapter VI.