selective serotonin reuptake inhibitor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An SSRI.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pharmacology Any of a class of drugs, such as fluoxetine or sertraline, that inhibit the uptake of serotonin in the central nervous system and are often used to treat certain mental illnesses, such as depression.