Definition of "dewy"

At midnight, in the month of June, / I stand beneath the mystic moon. / An opiate vapor, dewy, dim, / Exhales from out her golden rim

1831, Edgar Allan Poe, The Sleeper

Thy dewy looks sink in my breast / Thy gentle words stir poison there;

1814, 16 March, Percy Bysshe Shelley letter to Hogg, Thy Gentle Face

It was unusually early for him; his whole person exhaled the charm of almost dewy freshness; [...]

1906 January–October, Joseph Conrad, chapter II, in The Secret Agent: A Simple Tale, London: Methuen & Co., […], published 1907; The Secret Agent: A Simple Tale (Collection of British Authors; 3995), copyright edition, Leipzig: Bernhard Tauchnitz, 1907, page 13

Simplicity in life, simplicity in art, and a dewy freshness over all.

2009, Bernfried Nugel, Jerome Meckier, Aldous Huxley Annual, page 23