| 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) |
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| 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) |