sem·i·heav·y water 
(sĕm′ē-hĕvē, sĕm′ī-)
(sĕm′ē-hĕvē, sĕm′ī-)n.
A form of heavy water in which the oxygen atom is bound to one atom of hydrogen and one atom of deuterium (heavy hydrogen).
- 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
- out of stock
- out of the blocks
- out of the blue
- out of the chute
- out of the loop
- out of the question
- out of the running