Invólucro da semente das plantas.
(Do gr. peri + sperma)
pe-ris-per-ma
blastoderma, frinoderma, oncosperma, mesendoderma, oosperma, xeroderma, trofosperma, merma, mesoderma, derma, dictiosperma, endoderma, esperma, berma, tuberculoderma