primary feather

Found in Anh - Anh (Wordnet)

Definition Noun : A primary feather is one of the long, stiff, asymmetrical flight feathers located on the outermost segment (the manus or "hand") of a bird's wing. These are the main feathers responsible for providing thrust and forward propulsion during flight. Usage The term primary feather is used specifically in ornithology (the study of birds) and general descriptions of avian anatomy and...