irrorate

from The Century Dictionary.

• In zoology, dotted with white or light color, as if with dewdrops; in entomology, marked with minute dots of color: said especially of the wings of lepidopters when numerous single scales differ from the ground color.
• To moisten with dew.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb obsolete To sprinkle or moisten with dew; to bedew.
• adjective (Zoöl.) Covered with minute grains, appearing like fine sand.