placentation

[plas-uhn-tey-shuhn]
noun
1.
Anatomy, Zoology.
a.
the formation of a placenta.
b.
the manner of placement or construction of a placenta.
2.
Botany. the disposition or arrangement of a placenta or placentas.

Origin:
1750–60; < French; see placenta, -ation

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World English Dictionary
placentation (ˌplæsɛnˈteɪʃən)
 
n
1.  botany the way in which ovules are attached in the ovary
2.  zoology
 a.  the way in which the placenta is attached in the uterus
 b.  the process of formation of the placenta

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American Heritage
Medical Dictionary

placentation plac·en·ta·tion (plās'ən-tā'shən)
n.

  1. Formation of a placenta in the uterus.

  2. The type or structure of a placenta.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Loss of egg yolk genes in mammals and the origin of lactation and placentation.
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