di·graph 
(dīgrăf′)
(dīgrăf′)n.
1. A pair of letters representing a single speech sound, such as the ph in pheasant or the ea in beat.
2. A single character consisting of two letters run together and representing a single sound, such as Old English æ.
di·graphic (dī-grăfĭk) adj.
- out of gourd
- out of hand
- out of head
- out of humor
- out of it
- out of it
- out of joint
- out of key
- out of line
- out of luck
- out of one's gourd
- out of one's head
- out of phase
- out of play
- out of plumb
- out-of-pocket
- out of pocket
- out of print
- out of season
- out of sight
- out of sorts
- out of square
- out-of-state
- out-of-stater
- out of step