trade wind

Through the middle of the trade-wind zone extends the sub-equatorial belt, with its migrating calms, rains and monsoons.

At ten or eleven oclock of the morning, the heat of the tropics lifts its hat to the Doctor as the natives call the trade-wind.

Again, within this trade-wind region are the rainless countries.

In the deep and pure blue sky above them, fleecy clouds went past like galleons in a trade-wind.