滋润 (zī rùn) literally combines 滋 (zī), meaning 'to nourish' or 'to enrich', and 润 (rùn), meaning 'moist' or 'smooth'. Together, they convey the idea of providing moisture and nourishment — especially to skin, hair, or the body — restoring softness, elasticity, and vitality. It’s commonly used in health, beauty, and traditional Chinese medicine contexts to describe effects that counteract dryness and depletion.

The word functions both as an adjective ('moisturizing', 'nourishing') and a verb ('to moisturize', 'to nourish deeply'). As an adjective, it often modifies nouns like 皮肤 (skin), 嘴唇 (lips), or 肺 (lungs); as a verb, it appears in constructions like 有助于滋润… (helps nourish…) or 给…滋润 (provides moisture to…). While it can be used metaphorically (e.g., for enriching the mind or spirit), its most frequent usage relates to physical hydration and wellness.