pillpill /pɪl/ ●●● noun [countable] 1 a small solid piece of medicine that you swallow: She’s taking pills to control her blood pressure. sleeping pillsTHESAURUSmedicine, tablet, capsule, drug, medication, prescription► see thesaurus at medicine2the pill a pill taken regularly by some women in order to avoid having babies: Mary has been on the pill for years now. [Origin: 1400–1500 Latin pilula, from pila “ball”]