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{%type%} Definitions

WordNet 3.0Copyright Princeton University
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Short "hint"

Thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus.

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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.