| yolk cell | <cell biology> In those eggs in which the yolk is not distributed evenly (telolecithal eggs) the cells formed when cleavage reaches the yolk region can be termed yolk cells. (18 Nov 1997) |
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| yolk cells | Primitive embryonic cell's lying between the endoderm and mesoderm; they probably give rise to the endothelium of vitelline vessels. (05 Mar 2000) |
| yolk cleavage | Segmentation of the vitellus. (05 Mar 2000) |
| yolk membrane | The membrane enveloping the yolk; specifically, the thickened cell membrane of large-yolked ova. Synonym: ovular membrane, vitelline membrane. Sometimes used to designate the zona pellucida of a mammalian ovum. Synonym: yolk membrane. (05 Mar 2000) |
| yolk sac | <embryology, ornithology> One of the set of extra embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm. (18 Nov 1997) |
| yolk sac carcinoma | Malignant germ cell tumour commonly found in the ovary. The tumour arises from primitive germ cells and develops into extra-embryonic tissue resembling the yolk sac. Synonym: yolk sac carcinoma. (05 Mar 2000) |
| yolk sac tumour | An unusual and aggressive tumour of germ-cell origin that reproduces the extraembryonic structures of the early embryo. It is the most common malignant germ cell tumour found in children. It is characterised by a labyrinthine glandular pattern of flat epithelial cells and rounded papillary processes with a central capillary (schiller-duval body). The tumour is rarely bilateral. Before the use of combination chemotherapy, the tumour was almost invariably fatal. (12 Dec 1998) |
| yolk stalk | A narrow tube present in the early embryo that connects the midgut of the embryo (through the umbilical opening) to the yolk sac outside the embryo. Later in development, the yolk stalk is usually obliterated but a remnants of it may persist, most commonly as a finger-like protrusion from the small intestine known as meckel's diverticulum. Found in 2-4% of people, meckel's diverticulum may become inflamed much like the appendix and require surgical removal. The yolk stalk is also called the umbilical duct, vitelline duct, or oomphalomesenteric duct. (12 Dec 1998) |
| yoncopin | <botany> A local name in parts of the Mississippi Valley for the American lotus (Nelumbo lutea). Origin: Perhaps corrupted from Illinois micoupena, Chippewa makopin, the American lotus. Source: Websters Dictionary (01 Mar 1998) |
| yond | Furious; mad; angry; fierce. "Then wexeth wood and yond." Origin: Cf. AS. Anda, onda, anger, andian to be angry. Source: Websters Dictionary (01 Mar 1998) |
| yoni | The symbol under which Sakti, or the personification of the female power in nature, is worshiped. Cf. Lingam. Origin: Skr. Yni. Source: Websters Dictionary (01 Mar 1998) |
| Yorke's autolytic reaction | A test for paroxysmal haemoglobinuria; serum is placed in an ice chest and kept at 0°C for 5 to 7 minutes, then in an incubator at 37°C with erythrocytes for 1 hour, at which time, if the reaction is positive, haemolysis occurs; if the serum is kept at 1°C for an hour and then placed in the incubator with erythrocytes there is little haemolysis. (05 Mar 2000) |
| young | 1. Not long born; still in the first part of life; not yet arrived at adolescence, maturity, or age; not old; juvenile; said of animals; as, a young child; a young man; a young fawn. "For he so young and tender was of age." (Chaucer) ""Whom the gods love, die young," has been too long carelessly said; . . . Whom the gods love, live young forever." (Mrs. H. H. Jackson) 2. Being in the first part, pr period, of growth; as, a young plant; a young tree. "While the fears of the people were young." (De Foe) 3. Having little experience; inexperienced; unpracticed; ignorant; weak. "Come, come, elder brother, you are too young in this." (Shak) Origin: OE. Yung, yong, yong, yung, AS. Geong; akin to OFries. Iung, iong, D. Joing, OS, OHG, & G. Jung, Icel. Ungr, Sw. & Dan. Ung, Goth. Juggs, Lith. Jaunas, Russ. Iunuii, L. Juvencus, juvenis, Skr. Juvaca, juvan. Cf. Junior, Juniper, Juvenile, Younker, Youth. Source: Websters Dictionary (01 Mar 1998) |
| Young prostatic tractor | A short, straight tubular instrument with blades at its tip, which can be rotated open and closed; it is passed into the prostatic urethra, through a prostatotomy incision made during the later stages of open perineal prostatectomy, with its tip into the bladder; direct traction on the instrument brings the prostate gland down into the operative field where enucleation can be more easily performed. (05 Mar 2000) |
| Young syndrome | <syndrome> Obstructive azoospermia and chronic sinopulmonary infections. (05 Mar 2000) |
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| yolk |
This is the yellow nutrient containing sac in the egg that directly supports the growth of the embryo.
Ãâó: home.rochester.rr.com/thecaiques/glossary.htm
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| yeast |
a microscopic fungus that converts its food (carbohydrates) into carbon dioxide and alcohol through a metabolic process known as fermentation; yeast is necessary for making beer, wine, cheese and some breads.
Ãâó: www.cooksrecipes.com/cooking-dictionary/Y-search-r...
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| yogurt |
curdled or cultured milk dish with custard-like consistency used in main dishes, in sauces and in desserts.
Ãâó: www.cooksrecipes.com/cooking-dictionary/Y-search-r...
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| yeast |
A single-celled, eukaryotic organism. Some forms of yeast, including the brewer's yeast Saccharomyces cerevisiae, are popular experimental organisms.
Ãâó: www.nigms.nih.gov/news/science_ed/genetics/glossar...
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| Y chromosome |
plays a role in sex determination cyto
Ãâó: www.desicca.de/plant_breeding/Dictionary/Dictionar...
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| y | a person who yawns |
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| y | an involuntary intake of breath through a wide open mouth |
| y | showing lack of attention or boredom |
| y | gaping open as if threatening to engulf someone or something |
| y | with the mouth wide open indicating boredom or sleepiness |
| y | complain whiningly |
| y | make a raucous noise |
| y | an infectious tropical disease resembling syphilis in its early stages |
| y | a branch of the Tai languages |
| y | a river that rises in west central Mississippi and flows southwest to empty into the Mississippi River above Vicksburg |
| y | a river that rises in west central Mississippi and flows southwest to empty into the Mississippi River above Vicksburg |
| y | a soft silvery metallic element |
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