exodermis

[ek-suh-dur-mis]

ex·o·der·mis

[ek-suh-dur-mis]
noun Botany.
a temporary, protective layer of cells in some roots, as in certain orchids.

Origin:
1895–1900; exo- + -dermis

ex·o·der·mal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Exodermis is always a great word to know.
So is archegonia. Does it mean:
female reproductive organ which produces eggs in bryophytes, ferns and most gymnosperms
composed of several cells
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