definition of quill
quill noun [C]. âº a âlong, âsharp âpoint on a porcupine, or a âlarge âfeather with the end âcut to a âsharp âpoint that was used, esp. in the past, as a âpen.(Definition of quill from the Cambridge Academic Content Dictionary Â© Cambridge University Press).See all translations.uill noun [C]. âº a âlong, âsharp âpoint on a porcupine, or a âlarge âfeather with the end âcut to a âsharp âpoint that was used, esp. in the past, as a âpen.