Merriam-Webster Collegiate Dictionary - anacoluthon

 noun  (plural anacolutha; also -thons)  Etymology: Late Latin, from Late Greek anakolouthon inconsistency in logic, from Greek, neuter of anakolouthos inconsistent, from an- + akolouthos following, from ha-, a- together + keleuthos path  Date: circa 1706 syntactical inconsistency or incoherence within a sentence; especially a shift in an unfinished sentence from one syntactic construction to another (as in “you really ought—well, do it your own way”)  • anacoluthic adjective  • anacoluthically adverb