aplacental

Definitions

  • WordNet 3.6
    • adj aplacental having no placenta "monotremes and marsupials are aplacental mammals"
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Webster's Revised Unabridged Dictionary
    • a Aplacental Belonging to the Aplacentata; without placenta.
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Century Dictionary and Cyclopedia
    • aplacental Having no placenta; implacental: applied to those mammals in which no placenta is developed during gestation. The aplacental mammals comprise the Monotremata and Marsupialia, the two lowest orders of mammals, including the duck-mole, porcupine ant-eater, kangaroo, etc. The young are born at a much more immature stage of fetal development than in the placental mammals, and are so helpless that they are unable even to suck, and in most cases have to be fixed by the mother herself upon the teats, while the milk is forced into their mouths by a muscle which is spread over the mammary gland.
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Chambers's Twentieth Century Dictionary
    • adj Aplacental ap-la-sen′tal having no placenta.
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Etymology

Webster's Revised Unabridged Dictionary
Pref. a-, + placental,
Chambers's Twentieth Century Dictionary
a and Placental. See Placenta.