adaptive immune system(redirected from Acquired immune system)
Also found in: Medical.
adaptive immune system
The component of the vertebrate immune system involving lymphocytes (B cells and T cells) containing a small number of proteins that combine to produce an enormous variety of distinct proteins capable of recognizing and deactivating specific antigens. It is one of two main components of the immune system, along with the innate immune system.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.