Etymology
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placental (adj.)

"of or pertaining to a placenta," 1784, from Modern Latin placentalis, from placenta (see placenta).

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ovoviviparous (adj.)

"producing eggs which are hatched within the body of the parent, but without placental attachment," 1801, from combining form of ovum "egg" + viviparous "bringing forth young alive." It occurs in many reptiles, and some fishes, insects, worms, etc. Related: Ovoviviparity.

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