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The Collaborative International Dictionary
Cincinnus

Cincinnus \Cin*cin"nus\, n.; pl. -ni. [Also cicinus, cicinnus.] [L., a curl of hair.] (Bot.) A form of monochasium in which the lateral branches arise alternately on opposite sides of the false axis; -- called also scorpioid cyme. -- Cin*cin"nal, a.

Wiktionary
cincinnus

n. (context botany English), a type of monochasium on which the successive axis arise alternately in respect to the preceding one; a scorpioid cyme.