plerome

noun
ple·​rome | \ˈpliˌrōm\
variants: or less commonly plerom \ -​irəm \
plural -s

Definition of plerome 

1 : the central core of primary meristem of a plant or plant part that according to the histogen theory gives rise to the stele

2 : the stelar region in a root tip

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History and Etymology for plerome

German plerom, from Late Latin pleroma

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