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perique
periscope
periscopic
perish
perishable
perished
perisher
perishing
perisperm
perissodactyl
peristalsis
peristome
peristyle
perithecium
peritoneum
peritonitis
peritrack
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perisperm
per·i·sperm [ pérrə spùrm ]


noun 
Definition:
 
plant tissue: nutritive tissue from a plant nucleus that surrounds the seed embryo

per·i·sperm·al [ pèrrə spúrm'l ] adjective
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