Not from sun, yet still I gleam, a quiet night’s reflected beam.

I can describe a plant, the movement of water, and the operation of a machine. Alternatively, I can describe time, reptition, or the condition of a thing. If you want to really make things complicated, I can be a consecutive idiom, if you can keep up the pace and maintain a continuous flow. You can even find me useful at sea!

If you use me in moderation, you’ll feel fine; if you use me every day, I’ll do you harm and leave you with lasting effects.

my golden oil can be considered a sacrifice in a volcano, cultivated by the gods of olympus. What am I?

Something in song, bathtime and in flight