injectable /ɪnˈd͡ʒɛktəbəl/adjective 1noun 1forms 1 adjective1 •Capable of being (or designed to be) injected. noun1 •A liquid, such as a medicine or a Botox solution, which is injected using a needle and syringe.Complex high-cost drug therapy, such as injectables and infusions, are close to a $70 billion sector. — 2009 formsinjectables