Lexic.us

Definition of Placentation

1. Noun. The formation of the placenta in the uterus.

2. Noun. Arrangement of the ovules in the placenta and of the placentas in the ovary.

Definition of Placentation

1. n. The mode of formation of the placenta in different animals; as, the placentation of mammals.

Definition of Placentation

1. Noun. (biology) the local fusion of the embryonic stage of an animal to its parent for physiological exchange to promote the growth and development of the young; involves a placenta in non-egglaying mammals ¹

¹ Source: wiktionary.com

Definition of Placentation

1. [n -S]

Medical Definition of Placentation

1. In mammals, the process of a placenta forming during gestation. In plants, the arrangement of placentas, and hence of ovules, within an ovary. (31 Dec 1997)

Lexicographical Neighbors of Placentation

placental polyp placental presentation placental septa placental site trophoblastic tumour placental souffle placental stage of labour placental sulfatase deficiency placental thrombosis placental transfusion placentalia

placentals placentary placentas placentascan placentation (current term) placentations placentiferous placentiform placentious placentitis

placentography placentoma placentophagy placentotherapy placepot placepots placer placer miner placer mining

Literary usage of Placentation

Below you will find example usage of this term as found in modern and/or classical literature:

1. Agricultural Botany: Theoretical and Practical by John Percival (1921)
"placentation.—The arrangement of the placentas or points from which the ovules arise inside an ovary is termed placentation* When the ovules are arranged in ..."

2. Structural Botany: Or Organography on the Basis of Morphology. To which is by Asa Gray (1879)
"But a similar condition may equally arise from a modification of parietal placentation, namely, with the margins of the leaves ..."

3. The Journal of Anatomy and Physiology by Anatomical Society of Great Britain and Ireland (1889)
"THE only observations hitherto recorded on the placentation of the Dugong are by Paul Harting, of Utrecht, in 1878, who examined the foetal membranes of ..."

4. Second Book of Botany: A Practical Guide to the Observation and Study of Plants by Eliza Ann Youmans (1874)
"placentation. A After studying the structure of ovaries as explained in Ex. XXX., the following definitions will be easily understood: placentation. ..."

5. Descriptive Botany: A Practical Guide to the Classification of Plants, with by Eliza Ann Youmans (1885)
"placentation. After studying the structure of ovaries, as explained in Ex. XLII, the following definitions will be easily understood : placentation. ..."

6. Annals and Magazine of Natural History by William Jardine (1855)
"Some Remarks on Vegetable placentation. By JOHN CLELAND, Esq.* THE object of the few following remarks is to bring forward some evidence against the axile ..."

7. Introduction to Structural and Systematic Botany and Vegetable Physiology by Asa Gray (1866)
"... Thrift, &c., this is doubtless a modification of parietal placentation, with ovules produced only at the bottom. This brings us to the case of compound ..."

8. Agricultural Botany: Theoretical and Practical by John Percival (1921)
"placentation.—The arrangement of the placentas or points from which the ovules arise inside an ovary is termed placentation* When the ovules are arranged in ..."

9. Structural Botany: Or Organography on the Basis of Morphology. To which is by Asa Gray (1879)
"But a similar condition may equally arise from a modification of parietal placentation, namely, with the margins of the leaves ..."

10. The Journal of Anatomy and Physiology by Anatomical Society of Great Britain and Ireland (1889)
"THE only observations hitherto recorded on the placentation of the Dugong are by Paul Harting, of Utrecht, in 1878, who examined the foetal membranes of ..."

11. Second Book of Botany: A Practical Guide to the Observation and Study of Plants by Eliza Ann Youmans (1874)
"placentation. A After studying the structure of ovaries as explained in Ex. XXX., the following definitions will be easily understood: placentation. ..."

12. Descriptive Botany: A Practical Guide to the Classification of Plants, with by Eliza Ann Youmans (1885)
"placentation. After studying the structure of ovaries, as explained in Ex. XLII, the following definitions will be easily understood : placentation. ..."

13. Annals and Magazine of Natural History by William Jardine (1855)
"Some Remarks on Vegetable placentation. By JOHN CLELAND, Esq.* THE object of the few following remarks is to bring forward some evidence against the axile ..."

14. Introduction to Structural and Systematic Botany and Vegetable Physiology by Asa Gray (1866)
"... Thrift, &c., this is doubtless a modification of parietal placentation, with ovules produced only at the bottom. This brings us to the case of compound ..."

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