rarefy

Would an atmosphere perfumed by these Eastern woods clarify and rarefy our denser Occidental minds?

But as such means are not at disposal, it becomes necessary to place the terminal in a bulb and rarefy the air in the same.

The hot air in the smoke flues will warm the separating brick partition, and consequently rarefy the air in the ventilating flue.

The rarefy of the atmosphere continued to affect the wood-work of the wagons, and the wheels were incessantly falling to pieces.

But extend this vapour, rarefy it; from so narrow a room as our natural bodies, to any politic body, to a state.