hypocotyl

noun
hy·po·cot·yl | \ ˈhī-pə-ˌkä-tᵊl \

Definition of hypocotyl 

: the part of the axis of a plant embryo or seedling below the cotyledon — see seedling illustration

First Known Use of hypocotyl

1880, in the meaning defined above

History and Etymology for hypocotyl

short for hypocotyledonous (stem), from hypo- + cotyledon + -ous

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The first known use of hypocotyl was in 1880

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Britannica.com: Encyclopedia article about hypocotyl

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occurring twice a year or every two years

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