poly·cha·sium \| ̷ ̷ ̷ ̷|kāzh(ē)əm\noun (pluralpolycha·sia \-(ē)ə\) Etymology: New Latin, from poly- + -chasium (as in dichasium) : a cymose inflorescence in which each relative main axis produces more than two branches — compare dichasium, monochasium