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epitheca
noun
epi·theca
\"+\
Definition of epitheca
1 : an external calcareous layer investing the lower portion of the theca of many corals
2 : the outer or upper half or valve of the diatom frustule — compare hypotheca
epithecal
\"+\ orepithecate
\"+\ adjectiveExplore M-W
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Origin and Etymology of epitheca
New Latin, from epi- + -theca
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