1. Pertaining to dew; resembling, consisting of, or moist with, dew. A dewy mist went and watered all the ground. (Milton) When dewy eve her curtain draws. (Keble)
2. Falling gently and beneficently, like the dew. Dewy sleep ambrosial. (Cowper)
3. (Science: botany) Resembling a dew-covered surface; appearing as if covered with dew.