Dew that forms at night.

Dew formed or gathered on May Day or in the month of May, popularly supposed to have medicinal and cosmetic properties.

poetic. Dew occurring at sea; sea spray. Also figurative.

a dark greenish or yellowish-brown gelatinous substance found on damp ground, probably colonies of the cyanobacteria Nostoc (see nostoc, n.).

literary. Dew of the kind that settles on mountains.