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noun, Embryology.
any of the tissues, derived from the fertilized egg, that enclose or otherwise contribute to the support of the developing embryo, as the yolk sac, allantois, amnion, and chorion.


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  • Extrafloral

    [ek-struh-flawr-uh l, -flohr-] /ˌɛk strəˈflɔr əl, -ˈfloʊr-/ adjective, Botany. 1. situated outside the flower, as a nectary. /ˌɛkstrəˈflɒrəl/ adjective 1. produced or occurring outside a flower: extrafloral nectar, extrafloral nectary

  • Extragalactic

    [ek-struh-guh-lak-tik] /ˌɛk strə gəˈlæk tɪk/ adjective 1. outside the Milky Way system. /ˌɛkstrəɡəˈlæktɪk/ adjective 1. occurring or existing beyond the Galaxy

  • Extragalactic-nebula

    noun 1. (formerly) (def 1a). noun 1. the former name for galaxy

  • Extra-high voltage

    [ek-struh-hahy] /ˈɛk strəˌhaɪ/ noun 1. voltage in excess of 345 kilovolts, or 345,000 volts. Abbreviation: EHV.

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