It's a combination of vowels articulated without pause, as in "mouse"
A land laid waste with all its young men slain repeats the same a 
sound in laid, ... 9. caesura- a pause, usually near the middle of a line of verse, 
usually... [DOC] [TLE] Chapter 4 Pronunciation and Articulation Chapter Outline Variations ... [PAR] Pronunciation has to do with accent or dialect, and articulation with the ....