| allantoic | Pertaining to, or contained in, the allantois. Allantoic acid. <chemistry> See Allantoin. Origin: Cf. F. Allantoique. Source: Websters Dictionary (01 Mar 1998) |
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| allantoic acid | Diureidoacetic acid;a degradation product of allantoin. (05 Mar 2000) |
| allantoic bladder | A type of bladder formed as an outgrowth of the cloaca. (05 Mar 2000) |
| allantoic cyst | Cyst occurring in a persistent portion of the urachus, presenting as an extraperitoneal mass in the umbilical region. It is characterised by abdominal pain, and fever if infected. It may rupture, leading to peritonitis, or it may drain through the umbilicus. (12 Dec 1998) |
| allantoic diverticulum | An endoderm-lined outpouching of the hindgut (in humans, the yolk sac of a very young embryo) representing the primordium of the allantois; in most amniotes, it grows into the extraembryonic celom; in humans, the distal part of the allantoic lumen is rudimentary, not extending beyond the body stalk. Synonym: allantoenteric diverticulum. (05 Mar 2000) |
| allantoic fluid | The fluid within the allantoic cavity. (05 Mar 2000) |
| allantoic sac | The dilated distal portion of the allantois; it forms part of the placenta in many mammals. (05 Mar 2000) |
| allantoic vesicle | The hollow portion of the allantois. (05 Mar 2000) |
| allantoid | <anatomy> A membranous appendage of the embryos of mammals, birds, and reptiles, in mammals serving to connect the foetus with the parent; the urinary vesicle. Source: Websters Dictionary (01 Mar 1998) |
| allantoid membrane | An embryonic diverticulum of the hindgut of reptiles, birds, and mammals; in man its blood vessels give rise to those of the umbilical cord. (12 Dec 1998) |
| allantoidal | <anatomy> Of or pertaining to the allantois. Origin: Gr. Shaped like a sausage; sausage + form. Source: Websters Dictionary (01 Mar 1998) |
| allantoidea | <zoology> The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. Source: Websters Dictionary (01 Mar 1998) |
| allantoidoangiopagus | Synonym: omphaloangiopagus. See: allantoidoangiopagous twins. Origin: allantoid + G. Angeion, vessel, + pagos, fastened (05 Mar 2000) |
| allantoin | <pharmacology> Any of many nitrogen-containing organic compounds which are found in some plants and in the urine of some mammals. Allantoin is used to treat wounds and ulcers. (09 Oct 1997) |
| allantoinase | <enzyme> An enzyme (an amidohydrolase) that catalyses the hydrolysis of allantoin to allantoic acid. (05 Mar 2000) |