Soft, light, and airy; having a cloud-like or puffy appearance.
From 'fluff' (soft, downy material) with '-y' suffix, creating an adjective. 'Fluff' itself is onomatopoetic, resembling the softness it describes. The word became common in the 1800s to describe texture.
Fluffy is such a satisfying word—the double-f sound and the ending make it sound soft itself. Cats, clouds, pillows, and marshmallows are all fluffy, and the word sounds like what it means.
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