This is the 2814th most frequent Japanese word.
露
"露" (tsuyu or ro) means "dew," "exposure," or "revelation."
Here, "露" refers to dewdrops that form in the early morning.
朝、花びらに露が輝いていました。
In the morning, dewdrops were shining on the petals.
In this sentence, "露" is part of "露わ" meaning "revealed" or "exposed."
彼の隠した真実が露わになった。
The truth he was hiding became revealed.
The word "露" combines with "天" to mean "outdoors," as in "露天" or "open air."