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Definition of Aplacental
1. Adjective. Having no placenta. "Monotremes and marsupials are aplacental mammals"
Definition of Aplacental
1. a. Belonging to the Aplacentata; without placenta.
Definition of Aplacental
1. Adjective. Lacking a placenta; belonging to the Aplacentata. ¹
¹ Source: wiktionary.com
Medical Definition of Aplacental
1. Without a placenta; denoting the monotremes (which lay eggs and have no placenta) and the marsupials (which have a transitory simple yolk-sac placenta). (05 Mar 2000)
Lexicographical Neighbors of Aplacental
Literary usage of Aplacental
Below you will find example usage of this term as found in modern and/or classical literature:
1. The Student's Lyell: A Manual of Elementary Geology by Charles Lyell (1896)
"But with these aplacental mammals we have in the Older-Tertiary strata great
numbers of the higher or Fla- cental mammals, nearly all of which were ..."
2. Introductory text-book of geology by David Page (1873)
"I. MAMMALIA, or Sudden, subdivided into Placental and aplacental. 1. PLACENTAL,
bringing forth mature young. ... aplacental, bringing forth immature young. ..."
3. Orr's Circle of the Sciences: A Series of Treatises on the Principles of by William Somerville Orr (1855)
"In the present day zoologists are tolerably unanimous in regarding the aplacental
Mammals as a group apart, although offering many points of analogy with ..."
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