• (n. pl.) A Linnaean class of plants including all that have any number of stamens between twelve and nineteen.
Do`de·can'dri·a noun plural [ New Latin , from Greek ... twelve + ..., ..., man, male.] (Botany) A Linnæan class of plants including all that have any number of stamens between twelve and nineteen. 
In botany, dodecandria is the twelfth class of Linnasus, comprising plants having twelve to eighteen stamens.