Some definitions...

an

indef.art. 

The form of a used before words beginning with a vowel or with an unpronounced h: an elephant; an hour.

 odd

adj. odd·er, odd·est

1. Deviating from what is ordinary, usual, or expected; strange or peculiar: an odd name; odd behaviour.

2. 

a. Being one of an incomplete pair or set: an odd shoe.

b. Remaining after others have been paired or grouped.

3. Not expected, regular, or planned: called at odd intervals.

4. Remote; out-of-the-way: found the antique shop in an odd corner of town.

 

az·ure

n.

1. A light purplish-blue.

2. The blue sky.