implacental

American  

[im-pluh-sen-tl] / ˌɪm pləˈsɛn tl /

Also implacentate

adjective

1. Zoology. having no placenta, as a monotreme or marsupial.

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noun

1. an implacental mammal.

implacental British  

/ ˌɪmpləˈsɛntəl /

adjective

1. another word for aplacental

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Etymology

Origin of implacental

First recorded in 1830–40; im- ² + placental ( def. )

Example Sentences

See Examples For:

implacental

They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature.

From The Gutenberg Webster's Unabridged Dictionary Section M, N, and O by Project Gutenberg

On land, all the indigenous mammals, except bats, belong to the lowest, or implacental division; and the insects are singularly different from those found elsewhere.

From Essays: Scientific, Political, & Speculative, Vol. I by Spencer, Herbert

Again, the implacental mammals, including the Ornithodelphia and the Marsupials, are admitted to be lower than the placental series.

From Contributions to the Theory of Natural Selection A Series of Essays by Wallace, Alfred Russel