adjective Botany.
(of a primary xylem or root) developing from the periphery; having the oldest cells closest to the core.

1895–1900; end- + -arch having a point of origin (as specified)

endarchy, noun
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World English Dictionary
endarch (ˈɛndˌɑːk)
botany Compare exarch (of a xylem strand) having the first-formed xylem internal to that formed later
[C20: from endo- + Greek arkhē beginning]

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