| 释义 |
Definition of placentation in English: placentationnoun ˌplas(ə)nˈteɪʃ(ə)nˌplas(ə)nˈtāSH(ə)n mass nounAnatomy Zoology 1The formation or arrangement of a placenta or placentae in a woman's or female animal's uterus. 〔剖，动〕胎盘形成；胎盘构造；胎盘位置 Example sentencesExamples - 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.
- 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.
- 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.
- 1.1Botany The arrangement of the placenta or placentae in the ovary of a flower.
〔植〕胎座式 Example sentencesExamples - 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.
- 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.
- These are distinguished by characters of the bracts, placentation, inflorescence type, cytology and distribution.
- Salicornioideae seeds have a basal placentation, congruent with other representatives of the Chenopodiaceae.
- The ovary is superiorly positioned with basal placentation.
Definition of placentation in US English: placentationnounˌplas(ə)nˈtāSH(ə)n Anatomy Zoology 1The formation or arrangement of a placenta or placentae in a woman's or female animal's uterus. 〔剖，动〕胎盘形成；胎盘构造；胎盘位置 Example sentencesExamples - Most embryo clones fail to develop, and pregnancies terminate spontaneously due to fetal abnormalities or difficulties with placentation.
- 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.
- 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.
- The presence of an apparently unique type of lymphocyte in the uterus at implantation and during early placentation is intriguing.
- 1.1Botany The arrangement of the placenta or placentae in the ovary of a flower.
〔植〕胎座式 Example sentencesExamples - 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.
- 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.
- These are distinguished by characters of the bracts, placentation, inflorescence type, cytology and distribution.
- The ovary is superiorly positioned with basal placentation.
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