1d18 fillies Definition A free service provided by Writers Nexus International Writing Resources: New Novelist Software Writer Circles Author Me FirstWriter.com Novel Advice Robin's Nest for Writers The Scriptorium Women on Writing A Writer's Dictionary: Letter A Letter B Letter C Letter D Letter E Letter F Letter G Letter H Letter I Letter J Letter K Letter L Letter M Letter N Letter O Letter P Letter Q Letter R Letter S Letter T Letter U Letter V Letter W Letter X Letter Y Letter Z fillies Definition Dictionary Home » Words Starting with F » filarial ... filtration » fillies fillynoun fillies1. A young female horse or pony.2. colloqA young girl or woman.Etymology: 15c: probably from Norse fylja. Click Here © Mick Sanderson 2004. Site designed and developed by Joe Herbert.