As With the Shepherd's Panpipe Playing

Plenilune was not done surprising her.Plenilune
You must excuse my burgeoning curiosity.  I have finished (with a day to spare, but don't tell anyone yet) I have finished Actually Finishing Something July and am looking on beyond my scene to what comes next.  I have a cup of tea, there is a beautiful rain coming down, there is a cat on my lap, and lovely, sleepy music is playing in the background.  It is the perfect situation in which to write.  So you must excuse my curiosity.  I dare swear anything will remind you of your novel when that is all you are thinking about, but now I want to know:

What do you think of when you hear the name "Plenilune"?
As evidenced by my in-progress giveaway, I like names.  I like coming up with them; I like, even more, having come up with a really good one.  I don't always make them up myself, sometimes they are preexisting names: "plenilune," like "adamantine," is not a word of my own invention, but it is one of the most important titles in the whole story.  So tell me what you think!  What images does it conjure for you?  Does it sound odd?  Does it sound pretty?  Does it sound like Bilbo with a head-cold?  I want to see what the readers think!