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TB

Definition:

[noun] a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
Synonyms: terbium, Tb, atomic number 65
[noun] infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small lesions (usually in the lungs but in various other parts of the body in acute stages)
Synonyms: tuberculosis, TB, T.B.
[noun] a unit of information equal to a trillion (1,099,511,627,776) bytes or 1024 gigabytes
Synonyms: terabyte, TB