Source : Webster's Revised Unabridged Dictionary (1913)

Moonflower \Moon"flow`er\, n. (Bot.)
   (a) The oxeye daisy; -- called also {moon daisy}.
   (b) A kind of morning glory ({Ipom[oe]a Bona-nox}) with large
       white flowers opening at night.

Source : WordNet®

moonflower
     n : pantropical climber having white fragrant nocturnal flowers
         [syn: {belle de nuit}, {Ipomoea alba}]