American Heritage® Dictionary of the English Language, Fourth Edition
- n. Formation of a placenta in the uterus.
- n. The type or structure of a placenta.
- n. Botany Arrangement of placentas within the ovary.
Century Dictionary and Cyclopedia
- n. In zoology: The attachment of the embryo or fetus to the uterus by means of a placenta; uterogestation.
- n. The mode in which this attachment is effected; the manner of the disposition or construction of the placenta: as, deciduate or discoidal Placentation.
- n. In botany, the disposition or arrangement of the placentas.
- n. 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
GNU Webster's 1913
- n. (Anat.) The mode of formation of the placenta in different animals.
- n. (Bot.) The mode in which the placenta is arranged or composed
- n. the formation of the placenta in the uterus
- n. arrangement of the ovules in the placenta and of the placentas in the ovary
“Lucy did have one umbilical artery, and also at deliver, there was a little bit of abnormal placentation of the cord of the placenta.”
“Nurse Callan taken aback in the hallway cannot stay them nor smiling surgeon coming downstairs with news of placentation ended, a full pound if a milligramme.”
“First, we have in the bottom from which the mere structure of an ovary is deduced, the normal dicarpellary structure, and there is in addition a tendency in excess toward a parietal placentation.”
“The true place of Moringa seems to be near Xanthophyllum with which genus it has some remarkable points of resemblance, witness the papilionaceous corolla; unilocular stamina, their situation, ovary, placentation, and lastly glandulation.”
“We find the bottom of the tube is occupied by two cells, partially filled with ovula, which are attached both to the axis and to the base, as well as to the lower part of the outer paries of each cell; so far, it does not depart from the order, for in Aplexus the placentation is tolerably similar.”
“To Santalaceae they approach in processes, valvate corolla, and placentation, also to Loranthaceae.”
“_Rhododendron_ I have observed a similar condition of the ovules, which, moreover, in the primary flowers, were attached to the walls of the carpels -- parietal placentation.”
“Sutural, parietal, axile, free-central placentation, and, if there be more forms, all may be met with even in the same ovary (see pp. 96, 508).”
“The late Professor E. Forbes describes  an instance of true foliar and true axile placentation in the same flower in _Vinca minor_.”
“It will be remembered, also, how, in certain natural orders, under ordinary circumstances, considerable diversity in placentation exists, according as the margins of the carpels are merely valvate or are infolded so as to reach the centre.”
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