As jstro pointed out in the fifth post of this thread a cinquain is  “...a short, unrhymed poem of twenty-two syllables, five lines of 2, 4, 6, 8, 2 syllables respectively.” ( check above deadgirl1 to confirm this). If you look it up at the Wikipedia site you will find there are several forms, but the syllable form seems to have been adopted here. From the dictionary I found that the word is pronounced; "sing kayn".