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vivipary The method of reproduction in which: (a)a plant (e.g. mangroves) produces seeds that germinate within and obtain nourishment from the fruit;(b)a plant (e.g. some grasses) reproduces vegetatively from shoots rather than an inflorescence;(c)an animal produces young at a stage of development in which they are active, the growth of the embryo occurring within the mother's body, which nourishes it.Compare ovipary and ovovivipary.