Sentence:  The easterly or trade winds, which generally blow between the Tropics, are extremely refreshing to the coast of Guiana, between the hours of eight or ten in the morning, and six o'clock in the evening, when they cease to operate, and a <WSD>zephyr</WSD> is scarcely ever heard to whisper during the night. 
Meaning of the word marked with <WSD> tags:  Any light refreshing wind; a gentle breeze.