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extra-thecal
extra-thecal adj.
Brit. 
/ˌɛkstrəˈθiːkl/
, /ˌɛkstrəˈθiːkl/U.S. /ˌɛkstrəˈθik(ə)l/
Zoology and Botany situated outside the theca./ˌɛkstrəˈθik(ə)l/ΚΠ
1856 W. L. Lindsay Pop. Hist. Brit. Lichens 70 The spores..sometimes appear naked, or extrathecal.
1887 G. H. Fowler in Q. Jrnl. Microsc. Sci. XXVIII. 7 By far the greatest thickness of the coral is laid down..by the calicoblasts of the extra-thecal part of the polyp.
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as lemmas