| 单词 | placentation |
| 释义 | placentation (once / 218877 pages) n WORD FAMILY placenta: placentae, placental, placentas, placentation+/placental: placentals, transplacental USAGE EXAMPLESThe disjunction or dialysis of the carpels, for instance, frequently renders axile placentation marginal. Masters, Maxwell T., Vegetable Teratology—An Account of...(2010) In the flowers of Saponaria officinalis Dr. Masters has observed instances of both marginal and free central placentation. Darwin, Charles, The Origin of Species by means of N...(2010) In malformed flowers of Digitalis the change from axile to parietal placentation may often be seen. Masters, Maxwell T., Vegetable Teratology—An Account of...(2010) 1n the formation of the placenta in the uterus Hyper activity, bodily function, bodily process, body process an organic process that takes place in the body 2n arrangement of the ovules in the placenta and of the placentas in the ovary Hypo|Hyper apical placentation where one or few ovules develop at the top of a simple or compound ovary axile placentationovules are borne at or around the center of a compound ovary on an axis formed from joined septa basal placentationwhere one or few ovules develop at the base of a simple or compound ovary free central placentationwhere ovules develop on a central column in a compound ovary lacking septa or with septa at base only lamellate placentationwith ovules on thin extensions of the placentae into a compound ovary marginal placentation, ventral placentationwith ovules borne on the wall along the ventral suture of a simple ovary parietal placentationwhere ovules develop on the wall or slight outgrowths of the wall forming broken partitions within a compound ovary reproductive structure the parts of a plant involved in its reproduction |
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