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deutovum
deutovum n. 
/dʒuːˈtəʊvəm/,
Brit. /djuːˈtəʊvəm/
, /djuːˈtəʊvəm//dʒuːˈtəʊvəm/U.S. /d(j)uˈtoʊv(ə)m/
a secondary egg-cell, as contrasted with the protovum or normal and usual egg-cell; also called metovum, and after-egg./d(j)uˈtoʊv(ə)m/ΚΠ
1877 T. H. Huxley Man. Anat. Invertebrated Animals vii. 383 The proper vitelline membrane bursts into two halves..and the deutovum emerges.
1881 Athenæum 31 Dec. 904/2 The occurrence of a deutovum stage in the egg is recorded.
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