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n. pl. al·lan·to·i·des (ăl′ən-tō′ĭ-dēz′)
A membranous sac that develops from the posterior part of the digestive tract in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals. Also called allantoid.

[New Latin allāntois, variant of allāntoīdēs, from Greek allāntoeidēs, sausage-shaped : allās, allānt-, sausage (perhaps from Greek dialectal (Magna Graecia) *allāwent-, (sausage) seasoned with garlic, from *allā-, garlic, of Italic origin; akin to Latin ālium, garlic; see allium) + -oeidēs, -oid.]

al′lan·to′ic (ăl′ən-tō′ĭk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.allantoic - relating to or characterized by an allantoisallantoic - relating to or characterized by an allantois
References in periodicals archive ?
Virus RNA was extracted from MDCK culture supernatant or allantoic fluid by using the QIAamp Viral RNA Mini Kit (QIAGEN) according to manufacturer's instructions.
The infectious allantoic fluid was harvested and stored at -80[degrees]C until use.
Eggs were subsequently chilled to 4[degrees]C, and the allantoic fluid was tested for hemagglutination (HA) activity to confirm the presence of viral replicaion (2).
To determine resistance of highly pathogenic avian influenza (H5N1) virus to chlorination, we exposed allantoic fluid containing 2 virus strains to chlorinated buffer at pH 7 and 8, at 5[degrees]C.
Harvested allantoic fluid was tested for hemagglutination by using turkey erythrocytes.
50] of 1 of 7 avian influenza (H5N1) isolates, and 1 group received allantoic fluid as a negative control.
After incubation at 35[degrees]C for 48 h, the allantoic fluid was harvested, and virus was titrated by hemagglutination test with a 0.
The specimens from untreated hosts were isolated from the plasma of an H5N1-infected human (9) and from virus-containing allantoic fluid isolated from infected chickens, ducks, and cats (n = 16) during a 2005 outbreak in Thailand.
The reference strains of influenza A virus (A/PR/8/34-H1N1 and A/Udorn/307/72-H3N2) procured from CDC, Atlanta, GA, USA, and the pandemic H1N1-2009 (A/Delhi/1/2009-H1N1) isolated at our laboratory, to serve as positive control, were propagated to sufficiently high titres in 10-days old embryonated chicken eggs and the virus-containing allantoic fluid was harvested and stored in -80[degrees]C until use.