Definition of "spacer" [spacer]

• A person who works in space. (noun)
• An object inserted to hold a space open in a row of items, e.g. beads or printed type. (noun)
• A bushing. (noun)
• A forgetful person. (noun)
• A type of add-on device used by an asthmatic person to increase the effectiveness of a metered-dose inhaler. (noun)

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• "The first twenty-one pills have a combination of synthetic estrogen and progestin hormones; the last seven pills have no hormones and are called spacer pills, sugar pills, or inactive pills."
• "-- The use of a double-dose of fluid called spacer in the well."
• "I invented an extremely low-cost version of a device, known as a spacer, that dramatically increases the amount of medication that can reach the lungs of a child to relieve the symptoms of an asthma attack."