露点 is read as ろてん (roten) and means dew point.
ろてん
roten
ろてんけい
dew point hygrometer
ろてんしつどけい
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
ろてんしょう
street vendor
open air
ろじ
teahouse garden
ろこう