catabasis: the decline of a disease in a population
catadromous: migrating from fresh to salt water to spawn
atamount: any wild large species of cat

catarolysis: letting off steam by cursing
Though I was unable to fi;nd roots of this word, I did find another interesting one:
"catacosmesis" = ordering words according to descending order of importance."

catechectics: the art of teaching by question and answer
cateran: a Scottish military irregular or brigand
cathisophobia: fear of sitting
caudal: of or pertaining to the tail
caulotaxy: disposition and location of branches on a stem
cautelous: treacherous; cunning; wily; cautious
cavil: to raise trivial and frivolous objections
ceilometer: instrument for measuring height of cloud ceiling above earth
cellarer: monastery official in charge of provisions
celtuce: lettuce with an edible stalk
cendal: silk fabric resembling taffeta
censer: vessel for burning incense in religious rituals
cep: brown edible mushroom
cephalopod: creature with tentacles or limbs attached to head
ceraunograph: instrument for recording thunder and lightning
cerebration: unconscious action of the brain
ceromancy: divination by means of wax drippings
cervelat: smoked pork sausage
cessionary: someone to which something is ceded
chabouk: horse-whip
chain: unit of length equal to 20 metres
challis: soft lightweight silk, wool or cotton fabric
champaign: level countryside or plain

From the Dryden translation of Plutarch's Life of Sulla (aka Sylla).

Now that both armies were posted near each other, Archelaus lay still, but Sylla employed himself in cutting ditches from either side; that if possible, by driving the enemies from the firm and open champain, he might force them into the fens.

http://ancienthistory.about.com/library/bl/bl_text_plutarch_sylla.htm

My print edition has champaign rather than champain.

Bingley

I just saw this word used this way last week in Canton's book about the history/effects of the plague.. he used the term to define the great english plains of kent and devon -calling them the champaign of england.

interesting how words, just bubble up, and you find a new word again and again.