protease inhibitor

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

• noun An anti-HIV drug that blocks the action of the enzyme protease, which is needed for viral replication.

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

• noun pharmacology, virology A class of drugs used to treat or prevent infection by viruses such as HIV and hepatitis C.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs