placentation

名词 n.
中文释义

英文释义

名词 n.
  1. 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. countable,uncountable
    — Specialized hemophagous regions are a striking characteristic of some of these placentas yet absent in hyraxes, elephant shrews, and golden moles. It is possible that the common ancestor of the Afrotheria had an endotheliochorial placenta.
  2. The manner in which the seeds are attached to the placenta within the ovary locules. countable,uncountable
    — Parietal placentation occurs in the Brassicaceae family.

词形变化

placentations plural

词汇关系

衍生词
malplacentation

词源

Etymology tree
English placenta
Proto-Indo-European *-tis
Proto-Indo-European *-Hō
Proto-Indo-European *-tiHō
Proto-Italic *-tiō
Latin -tiō
Latin -ātiōlbor.
Old French -ationbor.
Middle English -acioun
English -ation
English placentation
From placenta + -ation.
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