plazentare

Plazentare is a term used in biology to refer to anything related to the placenta or to placentation—the development, structure, and organization of placental tissues. The word is derived from the Latin placenta and is used in various languages with forms such as placentare or plazentare; in English, the standard terms are placental or placentation. The exact usage can vary by language, and some texts may prefer different spellings.

In animals, placentation describes how a developing embryo connects to the maternal circulation through the placenta, enabling nutrient and gas exchange. The extent and invasiveness of placental tissue differ among vertebrates. Placental development is most advanced in eutherian (placental) mammals, more limited in many marsupials, and absent in monotremes. Scientific classifications of placentation often distinguish how the fetal and maternal tissues interact, using types such as hemochorial, endotheliochorial, and epitheliochorial to reflect the degree of tissue contact.

In plants, the related concept of placentation refers to the arrangement of ovules within the ovary and the tissue that connects them to the ovary wall. Common placentation patterns include axile, parietal, marginal, basal, and free-central. While the plant sense shares a name and a conceptual link to "placenta," it describes a different structural arrangement than in animals.

Overall, plazentare as a term covers placenta-related concepts in both animal reproduction and plant morphology, though the present-day usage of specific terms differs between the two fields.