/plas'euhn tay"sheuhn/, n.
1. Anat., Zool.
a. the formation of a placenta.
b. the manner of placement or construction of a placenta.
2. Bot. the disposition or arrangement of a placenta or placentas.
[1750-60; < F; see PLACENTA, -ATION]

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Universalium. 2010.

Look at other dictionaries:

  • placentation — [ plasɛ̃tasjɔ̃ ] n. f. • 1817 en bot.; de placenta 1 ♦ Embryol. Formation du placenta; manière dont il est disposé selon les espèces. Placentation diffuse, discoïde. 2 ♦ Bot. Manière dont les graines sont disposées sur le carpelle. Placentation… …   Encyclopédie Universelle

  • Placentation — Plac en*ta tion, n. 1. (Anat.) The mode of formation of the placenta in different animals; as, the placentation of mammals. [1913 Webster] 2. (Bot.) The mode in which the placenta is arranged or composed; as, axile placentation; parietal… …   The Collaborative International Dictionary of English

  • Placentation — Placentation, s. Fruchtknoten …   Meyers Großes Konversations-Lexikon

  • placentation — [plas΄ən tā′shən] n. 1. Anat. Zool. a) the formation or structure of a placenta b) the manner in which the placenta is attached to the uterus 2. Bot. the manner in which the placentas are arranged in an ovary …   English World dictionary

  • Placentation — In biology, placentation refers to the formation, type and structure, or arrangement of placentas. The function of placentation is to transfers nutrients from maternal tissue to a growing embryo. Placentation is best known in pregnant female… …   Wikipedia

  • placentation — noun 1. the formation of the placenta in the uterus • Hypernyms: ↑bodily process, ↑body process, ↑bodily function, ↑activity 2. arrangement of the ovules in the placenta and of the placentas in the ovary • Hypernyms: ↑reproductive structure …   Useful english dictionary

  • placentation — (pla sin ta sion) s. f. Terme de botanique. Manière dont les graines sont attachées au placenta.    Placentation pariétale, situation des placentas adhérents aux parois ovariennes …   Dictionnaire de la Langue Française d'Émile Littré

  • placentation — noun Date: 1760 1. the arrangement of placentas and ovules in a plant ovary 2. a. the development of the placenta and attachment of the fetus to the uterus during pregnancy b. the morphological type of a placenta …   New Collegiate Dictionary

  • placentation — noun the local fusion of the embryonic stage of an animal to its parent for physiological exchange to promote the growth and development of the young; involves a placenta in non egglaying mammals …   Wiktionary

  • placentation — The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta. Types of p. are defined under placenta. * * * pla·cen·ta·tion .plas ən tā shən, plə .sen n …   Medical dictionary

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