[1] : The Collaborative International Dictionary of English v.0.48

morning \morn"ing\, a.
   pertaining to the first part or early part of the day; being
   in the early part of the day; as, morning dew; morning light;
   morning service.
   1913 webster

         she looks as clear
         as morning roses newly washed with dew.  --shak.
   1913 webster

   morning gown, a gown worn in the morning before one is
      dressed for the day.

   morning gun, a gun fired at the first stroke of reveille at
      military posts.

   morning sickness med., nausea and vomiting, usually
      occurring in the morning; -- a common sign of pregnancy.
      

   morning star.
   a any one of the planets venus, jupiter, mars, or saturn
       when it precedes the sun in rising, esp. venus. cf.
       evening star, evening.
   b satan. see lucifer.
       1913 webster

             since he miscalled the morning star,
             nor man nor fiend hath fallen so far. --byron.
       1913 webster
   c a weapon consisting of a heavy ball set with spikes,
       either attached to a staff or suspended from one by a
       chain.

   morning watch naut., the watch between four a. m. and
      eight a. m..
      1913 webster morning glory
see also:
morning gown morning gun morning sickness morning star evening star evening 
lucifer morning watch 

[2] : WordNet (r) 2.0

morning sickness
     n : nausea early in the day; a characteristic symptom in the
         early months of pregnancy

Morning >> M Words
Morning, definition of term: Morning
morning_pag1.html

Sickness >> S Words
Sickness, definition of term: Sickness
sickness_pag1.html

Morning Star >> M Words
Morning Star, definition of term: Morning Star
morning+star_pag1.html

Morning Glory >> M Words
Morning Glory, definition of term: Morning Glory
morning+glory_pag1.html

Green Sickness >> G Words
Green Sickness, definition of term: Green Sickness
green+sickness_pag1.html

Motion Sickness >> M Words
Motion Sickness, definition of term: Motion Sickness
motion+sickness_pag1.html

Good Morning >> G Words
Good Morning, definition of term: Good Morning
good+morning_pag1.html