"place for weighing out medicines," 1690s, from Medieval Latin dispensarius "one who dispenses," from Latin dispensare (see dispense).
dispensary dis·pen·sa·ry (dĭ-spěn'sə-rē)
n.
An office in a hospital or other institution from which medical supplies and medicines are dispensed.
A public institution that dispenses medicines or medical aid.
An outpatient department of a hospital.