Tantalum is a metal element with the symbol Ta.
Tectonics — Tectonics is the study of rock movements.
Tellurium — Tellurium is a semi-metallic element with the symbol Te.
Tempering — Tempering is the process of heating up steel until red hot and then suddenly cooling it in water. The result is to harden the steel.
Terbium — Terbium is a metal element with the symbol Tb belonging to the series known as rare earths.
Thallium — Thallium is a metal element with the symbol Tl.
Thorium — Thorium is radioactive metal element with the symbol Th.
Thulium — Thulium is a metal element with the symbol Tm.
Tin-plate — Tin-plate is thin sheet iron or steel coated with pure metallic tin. Iron and steel are coated with tin to prevent rusting.
Tincal — Tincal is a crude form of borax found in lake-deposits in parts of Asia.
Tinplate — Tinplate is steel covered in tin.
Ton — The ton is a unit of measurement of the avoirdupois scale equivalent to 20 hundredweight, 2240 pounds or 1.016 tons.
Triassic — The Triassic was the ninth geological period, 170,000,000 years ago.
Tritium — Tritium is an unstable isotope of hydrogen.