Without a placenta; denoting the monotremes (which lay eggs and have no placenta) and the marsupials (which have a transitory simple yolk-sac placenta).

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apla·cen·tal .ā-plə-'sent-əl adj having or developing no placenta

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apla·cen·tal (a-plə-senґtəl) [a-1 + placenta] having no placenta.

Medical dictionary. 2011.

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Look at other dictionaries:

  • aplacental — APLACENTÁL, Ă adj. lipsit de placentă. (< engl. aplacental) Trimis de raduborza, 15.09.2007. Sursa: MDN …   Dicționar Român

  • Aplacental — Ap la*cen tal, a. [Pref. a + placental.] Belonging to the Aplacentata; without placenta. [1913 Webster] || …   The Collaborative International Dictionary of English

  • aplacental — [ā΄plə sent′ l] adj. having no true placenta, as any marsupial …   English World dictionary

  • aplacental — adjective having no placenta monotremes and marsupials are aplacental mammals • Ant: ↑placental …   Useful english dictionary

  • aplacental — viviparous reproduction in which embryos are not connected to their mother s blood supply by a placenta, as is the case in some sharks …   Dictionary of ichthyology

  • aplacental — /ay pleuh sen tl, ap leuh /, adj. Zool. having or forming no placenta, as the marsupials and monotremes. [1855 60; A 6 + PLACENTAL] * * * …   Universalium

  • aplacental — adj. lacking a placenta (Embryology) …   English contemporary dictionary

  • aplacental — apla·cen·tal …   English syllables

  • aplacental — /eɪpləˈsɛntl/ (say aypluh sentl) adjective not placental; having no placenta …  

  • aplacental viviparity — also called ovoviviparity (production of eggs that are fertilised and hatch inside the mother but the embryos lack a placental connection to the oviduct or uterus and so do not feed off the mother. The young are born as miniature adults, free… …   Dictionary of ichthyology

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