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Definition of: polychasium
(pol′i·kā′zē·əm, -zhē·əm) noun plural ·si·a (-zē·ə, -zhē·ə) Bot.
A form of cymose inflorescence in which, below each flower, more than two secondary branches are given off from the main axis. [<NL <POLY- + Gk. chasis division]
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