Definitions
1.nounA column of rising air in the lower atmosphere created by uneven heating of Earth's surface.
2.verb(stone) To create a rough finish on stone by treating it with a high-temperature blow-torch.
3.verb(gliding, often in the present participle) To fly an unpowered aircraft in a (thermal) column of rising air.
4.adjectivePertaining to heat or temperature.
5.adjective(fabric) Providing efficient insulation so as to keep the body warm.
6.adjectiveCaused or brought about by heat.
7.adjective(stone) Having a rough finish by treatment with a blow-torch.