plac·en·ta·tion

[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) [Click for IPA pronunciation guide]
 
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Placentation is always a great word to know.
So is bryophytes. Does it mean:
variation in an organism's life cycle of dissimilar reproductive forms
phylum of green, nonvascular, seedless plants comprised of true mosses, hornworts and liverworts
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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Loss of egg yolk genes in mammals and the origin of lactation and placentation.
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