polyembryony pol·y·em·bry·o·ny (pŏl'ē-ěm'brē-ə-nē, -ěm-brī'-)
Development of more than one embryo from a single egg or ovule.
Development from a single fertilized egg cell or, in plants, from a single ovule. In human beings, identical twins are the result of polyembryony. In gymnosperm plants, polyembryony involves the fertilization of more than one egg, though usually only one embryo survives in the ovule.