| 释义 |
Definition of allantois in English: allantoisnounPlural allantoides əˈlantəʊɪsəˈlan(t)ōəs The fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the embryo's gut. In birds and reptiles it grows to surround the embryo; in eutherian mammals it forms part of the placenta. Example sentencesExamples - In the fetus, the urachus connects the bladder with the allantois.
- Initially, the bladder is continuous with the allantois.
- The allantois is a structure that collects the waste that the embryo produces before it hatches.
- The urachus is a remnant of allantoic origin, connecting the embryonal cloaca to the allantois during early intrauterine life.
- Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
Derivatives adjective alənˈtəʊɪk We're talking about things like the amnion, the chorion, the allantoic sac, the placenta, the umbilical cord, if those words sound familiar to you. Example sentencesExamples - Veterinarians are completing the study comparing allantoic and amniotic fluids and heart rates of fetuses in mares.
- The embryo forms an allantoic placenta, as is true of at least some peramelids and koalas but not other marsupials.
- Again, we performed the tests on embryos, plus allantoic fluid from the eggs after five days.
- A feeding solution of 7.5 mM allantoic acid was used in most experiments.
adjective əˈlantɔɪd When screening germ plasm for Karnal bunt resistance, allantoid secondary sporidia produced in solid media should be used as inoculum. Example sentencesExamples - The spores are white, and are cylindrical to allantoid in shape.
- HvAV - 3a virions vary from allantoid to bacilliform, and are not occluded in occlusion bodies.
- The interesting foetal substances are those which were mentioned above, as well as allantoid liquid, Meckel's cartilage, Wharton's jelly and all the possible associations.
- They became electron-opaque and appeared allantoid in sections.
Origin Mid 17th century: modern Latin, based on Greek allantoeidēs 'sausage-shaped'. Definition of allantois in US English: allantoisnounəˈlan(t)ōəs The fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the embryo's gut. In birds and reptiles it grows to surround the embryo; in eutherian mammals it forms part of the placenta. Example sentencesExamples - Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
- The allantois is a structure that collects the waste that the embryo produces before it hatches.
- Initially, the bladder is continuous with the allantois.
- The urachus is a remnant of allantoic origin, connecting the embryonal cloaca to the allantois during early intrauterine life.
- In the fetus, the urachus connects the bladder with the allantois.
Origin Mid 17th century: modern Latin, based on Greek allantoeidēs ‘sausage-shaped’. |