露天 is read as ろてん (roten) and means open air.
ろてん
roten
ろてんしょう
street vendor
ろてんぶろ
open-air bath
ろてんしょうにん
ろてんぼり
surface mining
ろてんぼりたんこう
open-pit coal mine
てんしんりゅうろ
manifestation (revelation) of one's natural sincerity (naivete)
ろけん
discovery (of a plot, misdeed, etc.)
ろこつ
broad
ろしゅつ
exposure
ろてい
street stall
つゆ
dew