I’m reading a book written by a chiropractor, and every time I hit the name of his field of study, chiropractic, the word grates on my spine like fingernails on a chalkboard.
Why ‘chiropractic’ instead of ‘chiropractics’? All the other fields of study that end in ‘ic’, like ‘physics’, ‘fluidics’, or ‘statics’, tack an ‘s’ on the end. ‘Chiropractic’ sounds like an adjective.
Because it’s a coinage, and the coiner (D.D. Palmer) didn’t bother to coin a proper noun form. Followers simply retained the word as is.
If there were a noun form, it would probably be “chiropractition”, but since the “practic” part comes directly from the Greek “praktikos” rather than the English “practice”, that would be a back formation based on an incorrect assumption.
Ah, but ‘math’ (or ‘maths’) is a short form. The full name of the field is ‘mathematics’. The situation I describe would only obtain if we called it ‘mathematic’.
My question is solely linguistic. Let’s leave questions of whether it works out, okay?
Well, there isn’t a linguistically logical (by which I presume you mean consistent) form, because it’s a unique word. Chiropractition (or chiropractice) are linguistically elegant, but not logical.
I use organic in this sense to mean evolved from other words which are commonly used together, such as “alone”, which was originally a contraction of “all one”, or adopted from other languages, for example.
For example, orthopaedics comes from the French coinage orthopedique, which was coined in much the same way as chiropractic. However, because it was adopted from another language, there was an existing “declension” to fit it into (insofar as English can be said to have declensions).
If the estimable Doctor (I use the term loosely) Palmer had chosen to, he could simply have used “chiropractic” as an adjective only, and “chiropractics” or “chiropractic medicine” or “chiropractition” or whatever as the noun, but he didn’t.
In a couple of hundred years people will probably have started to do so, assuming their lawyers are still sending them to see quacks.