Home › Words › Q › quillwortquillwortquillwort means any of various simple microphyllous vascular plants, of the family Isoetaceae, that resemble rushes and produce spores.EtymologyFrom quill + wort.nounAny of various simple microphyllous vascular plants, of the family Isoetaceae, that resemble rushes and produce spores.Definitions & examples from Wiktionary (CC BY-SA 3.0).