(US, meteorology) A figure used by American meteorologists to describe the apparent heat felt by a person as the result of a combination of temperature and humidity.

Inability to tolerate or to be comfortable in warm or hot environments.

(idiomatic) The most demanding part of an endeavour; work requiring the most effort, resources, or consideration. / Used other than figuratively or idiomatically: see heavy, lifting.

Migraine.

plural of heart-failure

Alternative form of heartburn

Alternative form of heart failure

Having a generous heart or disposition; noble; liberal.

In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces.

Fuel made from denatured and jellied alcohol and contained in a canister with a removable top, designed to be burned directly from that canister.