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1[mass noun] The formation or arrangement of a placenta or placentae in a woman's or female animal's uterus.
- ‘Functional roles for relaxin within human reproductive tissues have also been implicated during placentation, parturition, and lactation.’
- ‘Although the exact etiology for placenta accreta and increta is not known, it is thought that damage to the decidua basalis may lead to abnormal placentation and its sequelae.’
- ‘Most embryo clones fail to develop, and pregnancies terminate spontaneously due to fetal abnormalities or difficulties with placentation.’
- ‘The presence of an apparently unique type of lymphocyte in the uterus at implantation and during early placentation is intriguing.’
- ‘Notably, in the three mammalian groups, equids, murids, and peromyscids, in which placental development of interspecific hybrids was analyzed to date, placentation defects were observed.’
- 1.1Botany The arrangement of the placenta or placentae in the ovary of a flower.
- ‘The ovary is superiorly positioned with basal placentation.’
- ‘These are distinguished by characters of the bracts, placentation, inflorescence type, cytology and distribution.’
- ‘Both genera were transferred to Flacourtiaceae by Warburg and later by Gilg on the basis of a number of morphological characters, such as a trimerous ovary with parietal placentation and anthers with longitudinal dehiscence.’
- ‘The berries in the most derived clade (Olmstead et al.'s subfamily ‘Solanoideae’) are all morphologically similar, with two carpels, axile placentation and mostly lenticular seeds.’
- ‘Salicornioideae seeds have a basal placentation, congruent with other representatives of the Chenopodiaceae.’
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