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/əˈlæntəʊ.ɪs/ · noun
(anatomy) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles..
Use allantois when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Allantois means (anatomy) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles..
Common synonyms include allantoic sac, allantoid.
The opposite depends on the specific sense.
Use allantois where its definition matches the intended context.
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