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1. (n.) placenta
the organ in most mammals, formed in the lining of the uterus by the union of the uterine mucous membrane with the membranes of the fetus, that provides for the nourishment of the fetus and the elimination of its waste products.
2. placenta
the part of the ovary of flowering plants that bears the ovules.
3. placenta
(in ferns and related plants) the tissue giving rise to sporangia.
Etymology: (1670–80; < NL: something having a flat, circular form, L: a cake < Gk plakóenta, acc. of plakóeis flat cake, der. of pláx (gen. plakós) flat)
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| Definition of 'placenta' |
Princeton's WordNet |
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1. (noun) placenta
that part of the ovary of a flowering plant where the ovules form
2. (noun) placenta
the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus
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| Definition of 'placenta' |
Webster Dictionary |
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1. (noun) placenta
the vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth
2. (noun) placenta
the part of a pistil or fruit to which the ovules or seeds are attached
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| Definition of 'placenta' |
U.S. National Library of Medicine |
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1. placenta
A highly vascularized mammalian fetal-maternal organ and major site of transport of oxygen, nutrients, and fetal waste products. It includes a fetal portion (CHORIONIC VILLI) derived from TROPHOBLASTS and a maternal portion (DECIDUA) derived from the uterine ENDOMETRIUM. The placenta produces an array of steroid, protein and peptide hormones (PLACENTAL HORMONES).
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Definitions of placenta 
