What is "dromaeognathous"

Dromaeognathous \Dro`m[ae]*og"na*thous\, a. [NL. dromaius emu + Gr. gna`qos jaw.] (Zo["o]l.) Having the structure of the palate like that of the ostrich and emu. [1913 Webster] ||

a. (context ornithology English) Possessing a palatal structure akin to the emu and the other (now extinct) species of the genus ''Dromaius''.

a. (alternative spelling of dromaeognathous English)