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perish
perishable
perished
perisher
perishing
perisperm
perissodactyl
peristalsis
peristome
peristyle
perithecium
peritoneum
peritonitis
peritrack
peritrich
periwig
periwinkle (1)
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peristome
per·i·stome [ pérrə stm ] (plural per·i·stomes)


noun 
Definition:
 
mouthparts of invertebrate: the mouthparts of an invertebrate such as an earthworm or echinoderm

per·i·sto·mal [ pèrrə stṓməl ] adjective
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