| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024pla•cen•ta /pləˈsɛntə/USA pronunciation n. [countable], pl. -tas, -tae /-ti/.USA pronunciation - Anatomy, Zoologyan organ in most mammals, formed in the lining of the uterus, that provides for the nourishment of the fetus.
pla•cen•tal, adj. WordReference Random House Unabridged Dictionary of American English © 2024pla•cen•ta (plə sen′tə),USA pronunciation n., pl. -tas, -tae (-tē).USA pronunciation - Anatomy, Zoologythe 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.
- [Bot.]
- Botanythe part of the ovary of flowering plants that bears the ovules.
- Botany(in ferns and related plants) the tissue giving rise to sporangia.
- Greek plakóenta, accusative of plakóeis flat cake, derivative of pláx (genitive plakós) flat
- Neo-Latin: something having a flat, circular form, Latin: a cake
- 1670–80;
Collins Concise English Dictionary © HarperCollins Publishers:: placenta /pləˈsɛntə/ n ( pl -tas, -tae / -tiː/)- the vascular organ formed in the uterus during pregnancy, consisting of both maternal and embryonic tissues and providing oxygen and nutrients for the fetus and transfer of waste products from the fetal to the maternal blood circulation
- the part of the ovary of flowering plants to which the ovules are attached
Etymology: 17th Century: via Latin from Greek plakoeis flat cake, from plax flat |