placenta previa placenta pre·vi·a (prē’vē-ə)
A condition in which the placenta is implanted in the lower segment of the uterus so that it is adjacent to or obstructs the internal opening of the cervix. It may cause maternal hemorrhage prior to or during labor. Also called placental presentation.
- Placenta reflexa
placenta reflexa placenta re·flex·a (rĭ-flěk’sə) n. An anomaly of the placenta in which the margin is thickened so as to appear turned back upon itself.
- Placenta spuria
placenta spuria placenta spu·ri·a (spyur’ē-ə) n. A mass of placental tissue that has no vascular connection with the main placenta.
[pluh-sen-teyt] /pləˈsɛn teɪt/ adjective 1. having a .
[plas-uh n-tey-shuh n] /ˌplæs ənˈteɪ ʃən/ noun 1. Anatomy, Zoology. 2. Botany. the disposition or arrangement of a placenta or placentas. /ˌplæsɛnˈteɪʃən/ noun 1. (botany) the way in which ovules are attached in the ovary 2. (zoology) placentation plac·en·ta·tion (plās’ən-tā’shən) n.