CHITTERLINGS is a 12 letter word that starts with C.
\Chit"ter*lings\, n. pl. [Cf. AS. cwi[thorn] womb, Icel. kvi[eth], Goth. qi[thorn]us, belly, womb, stomach, G. kutteln chitterlings.] (Cookery) The smaller intestines of swine, etc., fried for food.