di·cha·si·um 
(dī-kāzē-əm, -zhē-əm, -zhəm)
(dī-kāzē-əm, -zhē-əm, -zhəm)n. pl. di·cha·si·a (-zē-ə, -zhē-ə, -zhə)
A cyme having two lateral flowers or branches originating from opposite points beneath a terminal flower.
[New Latin, from Greek dikhasis, division, from dikhazein, to divide in two, from dikha, in two; see dwo- in the Appendix of Indo-European roots.]
di·chasi·al (-zē-əl, -zhē-əl, -zhəl) adj.