placentation

/ˈplæsnˌteɪʃən/

Definitions of placentation

1. noun

   the formation of the placenta in the uterus
   type of:

   activity, bodily function, bodily process, body process

   an organic process that takes place in the body
2. noun

   arrangement of the ovules in the placenta and of the placentas in the ovary
   types:

   apical placentation

   where one or few ovules develop at the top of a simple or compound ovary

   axile placentation

   ovules are borne at or around the center of a compound ovary on an axis formed from joined septa

   basal placentation

   where one or few ovules develop at the base of a simple or compound ovary

   free central placentation

   where ovules develop on a central column in a compound ovary lacking septa or with septa at base only

   lamellate placentation

   with ovules on thin extensions of the placentae into a compound ovary

   marginal placentation, ventral placentation

   with ovules borne on the wall along the ventral suture of a simple ovary

   parietal placentation

   where ovules develop on the wall or slight outgrowths of the wall forming broken partitions within a compound ovary

   type of:

   reproductive structure

   the parts of a plant involved in its reproduction