Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

CD4

play
noun, often attributive \ˌsē-(ˌ)dē-ˈfȯr\

Definition of CD4

  1. :  a large glycoprotein that is found on the surface especially of helper T cells, that is the receptor for HIV, and that usually functions to facilitate recognition of antigens by helper T cells



Origin of cd4

cluster of differentiation


First Known Use: 1984


Medical Dictionary

CD4

play
noun , often attributive \-ˈfōr, -ˈfȯr\

Medical Definition of CD4

  1. :  a large glycoprotein that is found especially on the surface of helper T cells, that is the receptor for HIV, and that usually functions to facilitate recognition by helper T cell receptors of antigens complexed with molecules of a class that are found on the surface of antigen-presenting cells (as B cells and macrophages) and are the product of genes of the major histocompatibility complex




Learn More about cd4

  1. Medical Dictionary: Definition of "CD4" Britannica.com: Encyclopedia article about "CD4"


Seen and Heard

What made you want to look up CD4? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

tending to dismiss important matters

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

perplex reduce disapprove soothe
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ