'Tracheophonae' definitions:

Definition of 'Tracheophonae'

From: GCIDE

Tracheophonae \Tra`che*oph"o*nae\, n. pl. [NL., from trachea + Gr. fonei^n to sound.] (Zool.) A group of passerine birds having the syrinx at the lower end of the trachea. [1913 Webster]