I’m stumped again. In reading a book on the American Civil War, I find the word:  SECECH used. I’m having trouble finding it in any standard dictinary. Is this a word that was used in the antebellum South?
Any help would be appreciated.

At first glance, it looked to be ethnolinguistic Anglo-American, which could rightly mean anything from hyperborean Algic to widespread Siouan-Catawban to Iroquoian Cherokee in cis-Appalachian United States.  Then I remembered something about squalid Gypsy curses and of how they always consist of one word only, all spoken with Indo-Aryan patois that nobody seems to use anymore.  But further research online indicates expletive "secech or secesh" to hail from the popular Dixie mantra "secessionist" which cannot have really become this postwar cuss word [se’sish or se’sich] until sometime after General RE Lee’s historic translation to Appomattox courthouse in a budding Virginia of 1865.

Your comments are right on, for this word was used in the book that I just finshed—- "Grant and Sherman-The Friendship that Won the Civil War, by Charles Bracelen Flood. In it, Sherman used it in a correspondence wth Grant. I felt that it was a reginal term, one that I would think is no longer used by those folks in the deep South—perhaps only sub rosa:)
I thank you for the help on this one.

Sorry for my half-cocked attitude regarding your blameless llintirin inquiry, for I am neither too fond of Cymreig nationalism, avaracious mercenaries nor even the US Congressional medal of honor, only because of the murderous carnage & senseless violence it may indeed be reasonably said to encourage—thus my restrained apprehension here!  But you should at least obtain better results if you replace this or that letter i with more orthgraphic y before going on to consult a Welsh Cymric or Cymraeg dictionary: such as llyntirin llyntyrin or llyntyryn each in its own right!

I liked Bandito’s explanation as well, credit where credit’s due.

As for llintyrn, it sounds as if it was something that the heroic Florence Nightingale used to carry about.  Something to do with luminaries ?