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perikaryon
peril
peril point
perilla
perilous
perilune
perilymph
perimeter
perimorph
perimysium
perinatal
perinatology
perinephrium
perineum
perineurium
period
period certain
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periderm

per·i·derm [ pérrə dùrm ]


noun 
Definition:
 
plant tissue: the outer layer of plant tissue in woody roots and stems


per·i·der·mal [ pèrrə dúrm'l ] adjective
per·i·der·mic [ pèrrə dúrmik ] adjective
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