Synonyms: primary, primary feather, primary quill
Definition: one of the main flight feathers projecting along the outer edge of a bird's wing
Similar words: quill, quill feather, pinion, flight feather
Definition: any of the larger wing or tail feathers of a bird
Definition: (noun) an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
optical aberration, distortion
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