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echinopaedium
echinopaedium n. 
/ˌɛkᵻnə(ʊ)ˈpiːdɪəm/,
Brit. /ᵻˌkʌɪnə(ʊ)ˈpiːdɪəm/
, /ᵻˌkʌɪnə(ʊ)ˈpiːdɪəm//ˌɛkᵻnə(ʊ)ˈpiːdɪəm/U.S. /əˌkaɪnəˈpidiəm/
a bilateral larva of an echinoderm./əˌkaɪnəˈpidiəm/ΚΠ
1877 T. H. Huxley Man. Anat. Invertebrated Animals 54 A singular series of changes undergone by the endoderm and mesoderm of the larva or Echinopædium.
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