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mesocotyl

noun
meso·​cot·​yl | \ˈme|zōˌkätᵊl, ˈmē|, |sō-\

Definition of mesocotyl 

: an elongated portion of the axis between the cotyledon and the coleoptile of a grass seedling

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History and Etymology for mesocotyl

mes- + -cotyl

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