Noun Definitionquill1.Definition: a stiff hollow protective spine on a porcupine or hedgehogCategory: Animals2.Definition: any of the larger wing or tail feathers of a birdRelated Noun(s):pinionCategory: Animals3.Definition: pen made from a bird's featherCategory: Objects4.Definition: the hollow spine of a featherRelated Noun(s):calamus, shaftCategory: Animals