etymology - Where does the suffix "-ker" come from?


A small number of words used in English have the derivational suffix "-ker" (maybe actually "-tiker"?), which appears to attach to words ending in "-sis". The only one I can remember off the top of my head is eidetiker = "one who is eidetic" (cf. eidesis), but I'm certain I've heard other instances.


Two questions:



  • Where does this suffix come from? It feels rather German to me, but I don't know any German, so I'm just spitballing here.

  • If you are a native speaker of English, do you feel that this suffix is productive today? A little while back (here), I used (coined?) the word "psychokinetiker" to mean "one who has the ability of psychokinesis", so clearly I feel that it's productive, but I suspect I might be idiosyncratic in this respect.




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