Opisthocœlia (opisthoseʻlia)

pl. [NL., opisthocœlian (ō-pis-tho-se'li-an), a. and n. [ or belonging to the order Opisthocælia. opisthocœlous (o-pis-tho-se lus), a. [ Opisthocomi (op-is-thok'ō-mi), n. pl. [NL., pl. of Opisthocomus, q. v.] An order of birds, represented by the genus Opisthocomus. It is an anomalous group, the sole surviving representative of an an cestral type of birds related to the Gallince. See Opistho comida. Hetero morphæ is a synonym.