Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

tat

play
verb \ˈtat\

Definition of tat

tat·tedtat·ting

  1. intransitive verb
  2. :  to work at tatting

  3. transitive verb
  4. :  to make by tatting



Origin of tat

back-formation from tatting


First Known Use: 1858

Other Handicraft Terms


2

tat

play
noun \ˈtat\

Definition of tat

  1. :  a small protein produced by a lentivirus (as HIV) that greatly increases the rate of viral transcription and replication and enhances the susceptibility of T cells to infection; also :  the viral gene that codes for the tat protein



Origin of tat

trans-activating transcriptional regulation


First Known Use: 1985

Other Biochemistry Terms


3

tat

play
noun \ˈtat\

Definition of tat

  1. :  tattoo

tat verb


Origin of tat

by shortening


First Known Use: 1987


TAT

abbreviation

Definition of TAT

  1. thematic apperception test




Medical Dictionary

tat

play
noun \ˈtat\

Medical Definition of tat

  1. 1:  a small protein produced by a lentivirus (as HIV) within infected cells that greatly increases the rate of viral transcription and replication and that is also secreted extracellularly where it plays a role in increasing viral replication in newly infected cells and in enhancing the susceptibility of T cells to infection—called also tat protein

  2. 2:  the viral gene that codes for the tat protein




TAT

abbreviation

Medical Definition of TAT

  1. thematic apperception test




Learn More about tat

  1. Medical Dictionary: Definition of "tat" Britannica English: Translation of "tat" for Arabic speakers


Seen and Heard

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

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

16.96 pounds 196.5 pounds 2.2 pounds 100 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ