a. and sb. Zool. [ad. Fr. allantoïdien: see prec. and -IAN.] A. adj. Having the fœtus furnished with an allantois. B. sb. An animal whose fœtus is so furnished.
1861. Hulme, trans. Moquin-Tandon’s Med. Zool., II. II. 62. Allantoidians = Mammalia, Aves, Reptilia.
