tb

1 of 4

abbreviation (1)

tablespoon; tablespoonful

Tb

2 of 4

symbol

terbium

TB

3 of 4

noun

ˌtē-ˈbē How to pronounce TB (audio)
: tuberculosis

TB

4 of 4

abbreviation (2)

1
thoroughbred
2
tubercle bacillus

Word History

Etymology

Noun

TB (abbreviation for tubercle bacillus)

First Known Use

Noun

1912, in the meaning defined above

Time Traveler
The first known use of tb was in 1912

Dictionary Entries Near tb

Taʽizz

tb

TB

See More Nearby Entries 

Cite this Entry

“Tb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tb. Accessed 22 Nov. 2024.

Copy Citation

Share

Kids Definition

TB

noun
(ˈ)tē-ˈbē
: tuberculosis

Medical Definition

Tb

1 of 3 symbol
terbium

TB

2 of 3 noun
(ˈ)tē-ˈbē How to pronounce TB (audio)
: tuberculosis

TB

3 of 3 abbreviation
tubercle bacillus
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Popular in Grammar & Usage

See All

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)

Plural and Possessive Names: A Guide

The Difference Between 'i.e.' and 'e.g.'

Why is '-ed' sometimes pronounced at the end of a word?

What's the difference between 'fascism' and 'socialism'?
See All

Popular in Wordplay

See All

8 Words with Fascinating Histories

8 Words for Lesser-Known Musical Instruments

Birds Say the Darndest Things

10 Words from Taylor Swift Songs (Merriam's Version)

10 Scrabble Words Without Any Vowels
See All

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Word Game Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
Missing Letter A daily crossword with a twist
turkey-looking-at-camera
Giving Thanks Quiz Decide which words express gratitude and which gi...