noun
dew
Water droplets that form on cool surfaces overnight. Also used poetically.
朝、草の葉に露が光っていた。
In the morning, dew glistened on the blades of grass.
Tears ran down her cheeks.
adverb
Used with a negative predicate to mean 'not even a little'. Often in the phrase 露ほども...ない or 露知らず.
See also: 露聊かも
彼は露ほども疑っていなかった。
He didn't suspect a thing.
涙 is the ordinary word for tears. 露 is a poetic metaphor for tears.
少しも...ない is the common way to say 'not at all'. 露...ない is a literary equivalent.
The kanji 露 means 'dew' and is used for its literal meaning as well as metaphorically for tears and for the adverbial sense of 'a tiny amount', drawing on the image of a small, fleeting dewdrop.