morning glory

Short definition from Wiktionary

Noun

1. 1
   Several members of the family Convolvulaceae; climbing plants with trumpet shaped flowers.
2. 2
   An involuntary erection present upon waking.
3. 3
   A morning bout of love-making.
4. 4
   A rolling cloud in the shape of a cylinder; a roll cloud.
5. 5
   Alternative form of morning glory.