plural amphithecia\ -​ēə \

Definition of amphithecium

1 : the external layer of cells surrounding the sporogenous tissue in the sporangium of a moss
2 : the inner layer of the perithecium next to the hymenium in certain lichens

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First Known Use of amphithecium

1872, in the meaning defined at sense 1

History and Etymology for amphithecium

New Latin, from amphi- + -thecium

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The first known use of amphithecium was in 1872

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