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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
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placentation
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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 pariétale — ● Placentation pariétale chez les plantes, placentation d un ovaire uniloculaire qui porte ses ovules sur la suture des carpelles (orchidacées, salicacées, papavéracées…) … Encyclopédie Universelle
Placentation septale — ● Placentation septale caractère des plantes dont les ovules sont implantés sur la paroi d un ovaire à une seule loge … Encyclopédie Universelle
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 — /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] * * * … Universalium
