biennial      once every two years.
biannual twice a year.
prolepsis an occurrence or assignment before the actual or expected time; (rhet.) the anticipation of possible objections.
apophasis (rhet.) mentioning a subject while disavowing any intention of doing so.
enantiosis (rhet.) a figure of speech whose intent is at odds with its appearance; irony.
tmesis the transposition of a word or words into the middle of a compound word.
battology excessive repetition of words.
enallage (rhet.) a substitution of grammatical forms, as plural for singular.
hypallage (rhet.) the interchange of a syntactic relation.
dextrocardia a condition in which the heart is on the right side of the chest, possibly with reflection of its chambers as well.
hyperbaton (rhet.) unusual word ordering, often emphatic.